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Fix Windows 7 x3daudio1_7 dll

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This section lists the error codes and possible resolutions for the error codes. The error codes are listed in numeric order.

Code 1

This device is not configured correctly. (Code 1)
Cause

The device has no drivers installed on your computer, or the drivers are configured incorrectly.

Recommended resolution

Download the Troubleshooting Wizard to resolve the problem :

In the device’s Properties dialog box, click the Driver tab, and then click Update Driver to start the Hardware Update Wizard. Follow the instructions to update the driver. If updating the driver does not work, see your hardware documentation for more information.

Note You may be prompted to provide the path of the driver. Windows may have the driver built-in, or may still have the driver files installed from the last time that you set up the device. If you are asked for the driver and you do not have it, you can try to download the latest driver from the hardware vendor’s website.

Code 3

The driver for this device might be corrupted, or your system may be running low on memory or other resources. (Code 3)
Recommended resolutions

Close some open applications

If the computer has insufficient memory to run the device, you can close some applications to make memory available. You can also check memory and system resources, and the virtual memory settings.

  • To check memory and system resources, open Task Manager. To do this, press CTRL+ALT+DELETE, and then click Task Manager.
  • To check virtual memory settings, open the System Properties dialog box, click the Advanced tab, and then clickSettings in the Performance area.

Uninstall and reinstall the driver

The device driver may have become corrupted. If the driver is corrupted, uninstall the driver from Device Manager and scan for new hardware to install the driver again.

  1. In the device’s Properties dialog box, click the Driver tab, and then click Uninstall. Follow the instructions.
  2. Restart your computer.
  3. Open Device Manager, click Action, and then click Scan for hardware changes. Follow the instructions.

Note You may be prompted to provide the path of the driver. Windows may have the driver built-in, or may still have the driver files installed from the last time that you set up the device. However, sometimes, it will open the New Hardware Wizard which may ask for the driver. If you are asked for the driver and you do not have it, you can try to download the latest driver from the hardware vendor’s website.

Install additional RAM

You may have to install additional random access memory (RAM).

Code 10

This device cannot start. (Code 10)

Note If the device has a FailReasonString value in its hardware key, that string is displayed as the error message. The driver or enumerator puts this registry string value in the error message.

Recommended resolutions

Update the driver

In the device’s Properties dialog box, click the Driver tab, and then click Update Driver to start the Hardware Update Wizard. Follow the instructions to update the driver.

Note You may be prompted to provide the path of the driver. Windows may have the driver built-in, or may still have the driver files installed from the last time that you set up the device. If you are asked for the driver and you do not have it, you can try to download the latest driver from the hardware vendor’s website.

View the related article in the Microsoft Knowledge Base

Recommended resolution

Download the Troubleshooting Wizard to resolve the problem :

.

Code 12

This device cannot find enough free resources that it can use. If you want to use this device, you will need to disable one of the other devices on this system. (Code 12)
Cause

This error can occur if two devices that are installed on your computer have been assigned the same I/O ports, the same interrupt, or the same Direct Memory Access channel (either by the BIOS, the operating system, or both). This error message can also appear if the BIOS did not allocate enough resources to the device.

Recommended resolution

You can use the Troubleshooting Wizard in Device Manager to determine where the conflict is, and then disable the conflicting device.

Disable the conflicting device by using the Troubleshooting Wizard

  1. In the device’s Properties dialog box, click the General tab.
  2. Click Troubleshoot to start the Troubleshooting Wizard. The wizard asks you some simple questions and provides a solution to your problem based on the answers that you provide.
  3. Follow the resolution steps provided by the wizard to resolve the problem.

Code 14

This device cannot work properly until you restart your computer. (Code 14)
Recommended resolution

Restart your computer

Click Start, click Shut Down, and then select Restart in the Shut Down Windows dialog box to restart the computer.

Code 16

Windows cannot identify all the resources this device uses. (Code 16)
Cause

The device is only partly configured.

Recommended resolution

Assign additional resources to the device

Note The following steps might only work if the device is a Plug and Play device. If the device is not a Plug and Play device, you can refer to the device documentation for more information.

  1. In the device’s Properties dialog box, click the Resources tab.
  2. If a resource is listed with a question mark next to it, select that resource to assign it to the device.
    • If the resource cannot be changed, click Change Settings.
    • If Change Settings is unavailable, try clearing the Use automatic settings check box to make it available.

Code 18

Reinstall the drivers for this device. (Code 18)
Recommended resolution

Update the driver. If that does not work, reinstall the driver for this device through Device Manager.

Update the driver

In the device’s Properties dialog box, click the Driver tab, and then click Update Driver to start the Hardware Update Wizard. Follow the instructions to update the driver. If this does not work, you will have to uninstall and reinstall the driver.

Note You may be prompted to provide the path of the driver. Windows may have the driver built-in, or may still have the driver files installed from the last time that you set up the device. If you are asked for the driver and you do not have it, you can try to download the latest driver from the hardware vendor’s website.

Uninstall and reinstall the driver

If the driver is corrupted, uninstall the driver from Device Manager and scan for new hardware to install the driver again.

  1. In the device’s Properties dialog box, click the Driver tab, and then click Uninstall. Follow the instructions.
  2. Restart your computer.
  3. Open Device Manager, click Action, and then click Scan for hardware changes. Follow the instructions.

Code 19

Windows cannot start this hardware device because its configuration information (in the registry) is incomplete or damaged. To fix this problem you can first try running a Troubleshooting Wizard. If that does not work, you should uninstall and then reinstall the hardware device. (Code 19)
Cause

A registry problem was detected.

This can occur when more than one service is defined for a device, if there is a failure opening the service subkey, or if the driver name cannot be obtained from the service subkey.

Recommended resolutions

To fix this problem you can first try running the Troubleshooting Wizard. If that does not work, you can try the following methods to resolve this problem.

Uninstall and reinstall the driver

Uninstall the driver from Device Manager and scan for new hardware to install the driver again.

  1. In the device’s Properties dialog box, click the Driver tab, and then click Uninstall. Follow the instructions.
  2. Restart your computer.
  3. Open Device Manager, click Action, and then click Scan for hardware changes. Follow the instructions.

Note You may be prompted to provide the path of the driver. Windows may have the driver built-in, or may still have the driver files installed from the last time that you set up the device. However, sometimes, it will open the New Hardware Wizard which may ask for the driver. If you are asked for the driver and you do not have it, you can try to download the latest driver from the hardware vendor’s website.

Revert to the most recent successful registry configuration

The Last Known Good Configuration feature is a recovery option that you can use to start your computer by using the most recent settings that worked. The Last Known Good Configuration feature restores all the registry information and driver settings that were in effect the last time that the computer started successfully.

For more information about the Last Known Good Configuration feature, click the following links:

Recommended resolution

Download the Troubleshooting Wizard to resolve the problem :

 

Code 21

Windows is removing this device. (Code 21)
Recommended resolution

This error means that Windows is in the process of removing the device. However, the device has not yet been completely removed. Here are some methods that you can try to resolve this problem.

  • Wait several seconds, and then press the F5 key to update the Device Manager view.
  • If that does not resolve the problem, restart your computer. Click Start, click Shut Down, and then select Restart in theShut Down Windows dialog box to restart the computer.

Code 22

This device is disabled. (Code 22)
Recommended resolution

Enable the device by using Device Manager.

In Device Manager, click Action, and then click Enable Device. This starts the Enable Device wizard. Follow the instructions.

Code 24

This device is not present, is not working properly, or does not have all its drivers installed. (Code 24)
Cause

The device is installed incorrectly. The problem could be a hardware failure, or a new driver might be needed.
Devices stay in this state if they have been prepared for removal. After you remove the device, this error disappears.

Recommended resolution

Remove the device, and this error should be resolved.

Code 28

The drivers for this device are not installed. (Code 28)
Recommended resolution

Install the driver

In the device’s Properties dialog box, click the Driver tab, and then click Update Driver to start the Hardware Update Wizard. Follow the instructions to install the driver.

Note You may be prompted to provide the path of the driver. Windows may have the driver built-in. If you are asked for the driver and you do not have it, you can try to download the latest driver from the hardware vendor’s website.

Code 29

This device is disabled because the firmware of the device did not give it the required resources. (Code 29)
Recommended resolution

Enable the device in the BIOS

Enable the device in the BIOS of the device. For information about how to make this change, see the hardware documentation or contact the hardware vendor.

Code 31

This device is not working properly because Windows cannot load the drivers required for this device. (Code 31)
Recommended resolution

Update the driver

In the device’s Properties dialog box, click the Driver tab, and then click Update Driver to start the Hardware Update Wizard. Follow the instructions to update the driver.

Note You may be prompted to provide the path of the driver. Windows may have the driver built-in, or may still have the driver files installed from the last time that you set up the device. However, sometimes, it will open the New Hardware Wizard which may ask for the driver. If you are asked for the driver and you do not have it, you can try to download the latest driver from the hardware vendor’s website.

Code 32

A driver (service) for this device has been disabled. An alternate driver may be providing this functionality. (Code 32)
Cause

The start type for this driver is set to disabled in the registry.

Recommended resolutions

Reinstall the driver for this device. If this does not work, you might have to change the device start type parameter in the registry.

Uninstall and reinstall the driver

Uninstall the driver from Device Manager, and then scan for new hardware to install the driver again.

  1. In the device’s Properties dialog box, click the Driver tab, and then click Uninstall. Follow the instructions.
  2. Restart your computer.
  3. Open Device Manager, click Action, and then click Scan for hardware changes. Follow the instructions.

Note You may be prompted to provide the path of the driver. Windows may have the driver built-in, or may still have the driver files installed from the last time that you set up the device. However, sometimes, it will open the New Hardware Wizard which may ask for the driver. If you are asked for the driver and you do not have it, you can try to download the latest driver from the hardware vendor’s website.

Change the start type in the Registry

As a last resort, you can edit the registry directly if the driver is required, and if reinstalling or upgrading does not work. Change the start type inside the registry by using Registry Editor.

Code 33

Windows cannot determine which resources are required for this device. (Code 33)
Cause

The translator that determines the kinds of resources that are required by the device has failed.

Recommended resolution

Configure the hardware. If configuring the hardware does not work, you might have to replace it.

Configure or replace the hardware

If running the Troubleshooting Wizard did not resolve the problem, configure or replace the device. Contact the device hardware vendor for more information about how to configure or replacing the device.

Code 34

Windows cannot determine the settings for this device. Consult the documentation that came with this device and use the Resource tab to set the configuration. (Code 34)
Recommended resolution

Manually configure the device

The device requires manual configuration. See the hardware documentation or contact the hardware vendor for instructions on manually configuring the device. After you configure the device itself, you can use the Resources tab in Device Manager to configure the resource settings in Windows.

Code 35

Your computer’s system firmware does not include enough information to properly configure and use this device. To use this device, contact your computer manufacturer to obtain a firmware or BIOS update. (Code 35)
Cause

The Multiprocessor System (MPS) table, which stores the resource assignments for the BIOS, is missing an entry for your device and must be updated.

Recommended resolution

Contact the system vendor to update the BIOS.

Code 36

This device is requesting a PCI interrupt but is configured for an ISA interrupt (or vice versa). Please use the computer’s system setup program to reconfigure the interrupt for this device. (Code 36)
Recommended resolution

The interrupt request (IRQ) translation failed. Change the settings for the IRQ reservations.

Change the settings for IRQ reservations

For more information about how to change BIOS settings, see the hardware documentation.

You can also try to use the BIOS setup tool to change the settings for IRQ reservations (if such options exist). The BIOS might have options to reserve certain IRQs for peripheral component interconnect (PCI) or ISA devices.

Code 37

Windows cannot initialize the device driver for this hardware. (Code 37)
Recommended resolution

The driver returned a failure when it executed the DriverEntry routine. Reinstall the drivers for this device.

Uninstall and reinstall the driver

Uninstall the driver from Device Manager, and then scan for new hardware to install the driver again.

  1. In the device’s Properties dialog box, click the Driver tab, and then click Uninstall. Follow the instructions.
  2. Restart your computer.
  3. Open Device Manager, click Action, and then click Scan for hardware changes. Follow the instructions.

Note You may be prompted to provide the path of the driver. Windows may have the driver built-in, or may still have the driver files installed from the last time that you set up the device. However, sometimes, it will open the New Hardware Wizard which may ask for the driver. If you are asked for the driver and you do not have it, you can try to download the latest driver from the hardware manufacturer’s website.

Code 38

Windows cannot load the device driver for this hardware because a previous instance of the device driver is still in memory. (Code 38)
Recommended resolution

The driver could not be loaded because a previous instance is still loaded. Restart the computer.

Use the Troubleshooting Wizard

If you have not already run the Troubleshooting Wizard, do so now.

  1. In the device’s Properties dialog box, click the General tab.
  2. Click Troubleshoot to start the Troubleshooting Wizard. The wizard asks you some simple questions and provides a solution to your problem based on the answers that you provide.
  3. Follow the resolution steps provided by the wizard to resolve the problem.

Restart your computer

Click Start, click Shut Down, and then select Restart in the Shut Down Windows dialog box to restart the computer.

Code 39

Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)
Cause

There are several causes of Code 39 errors:

  • A required device driver is missing.
  • A required binary file is corrupted.
  • There is a problem with the file I/O process.
  • A driver that is referencing an entry point in another binary file is unable to load.
Recommended resolution

Uninstall and reinstall the driver

Uninstall the driver from Device Manager, and then scan for new hardware to install the driver again.

  1. In the device’s Properties dialog box, click the Driver tab, and then click Uninstall. Follow the instructions.
  2. Restart your computer.
  3. Open Device Manager, click Action, and then click Scan for hardware changes. Follow the instructions.

Note You may be prompted to provide the path of the driver. Windows may have the driver built-in, or may still have the driver files installed from the last time that you set up the device. However, sometimes, it will open the New Hardware Wizard which may ask for the driver. If you are asked for the driver and you do not have it, you can try to download the latest driver from the hardware vendor’s website.

Code 40

Windows cannot access this hardware because its service key information in the registry is missing or recorded incorrectly. (Code 40)
Recommended resolution

Information in the registry’s service subkey for the driver is invalid. Reinstall the drivers for this device.

Uninstall and reinstall the driver

Uninstall the driver from Device Manager, and then scan for new hardware to install the driver again.

  1. In the device’s Properties dialog box, click the Driver tab, and then click Uninstall. Follow the instructions.
  2. Restart your computer.
  3. Open Device Manager, click Action, and then click Scan for hardware changes. Follow the instructions.

Note You may be prompted to provide the path of the driver. Windows may have the driver built-in, or may still have the driver files installed from the last time that you set up the device. However, sometimes, it will open the New Hardware Wizard which may ask for the driver. If you are asked for the driver and you do not have it, you can try to download the latest driver from the hardware vendor’s website.

Code 41

Windows successfully loaded the device driver for this hardware but cannot find the hardware device. (Code 41)
Recommended resolution

This problem occurs if you install a driver for a non-Plug and Play device, but Windows cannot find the device. Here are some things that you can try to resolve this problem.

If the Troubleshooting Wizard does not resolve the problem, do one of the following:

  • If the device was removed, uninstall the driver, connect the device, and then click Scan for hardware changes to reinstall the driver.
  • If the hardware was not removed, the driver files might be obsolete. In this case, update the driver from Device Manager. In the device Properties dialog box, click the Driver tab, and then click Update Driver to start the Hardware Update Wizard. Follow the instructions to update the driver.
  • If the device is a non-Plug and Play device, you may have to install a newer version of the driver. To install non-Plug and Play devices, use the Add Hardware wizard. Click Start, and then click Run. In the Open box, type hdwwiz.cpl.

Code 42

Windows cannot load the device driver for this hardware because there is a duplicate device already running in the system. (Code 42)
Recommended resolution

A duplicate device was detected. This error occurs when a bus driver incorrectly creates two identically named sub-processes (known as a bus driver error), or when a device with a serial number is discovered in a new location before it is removed from the old location. You may be able to resolve this problem by restarting your computer.

Restart your computer

Click Start, click Shut Down, and then select Restart in the Shut Down Windows dialog box to restart the computer.

Code 43

Windows has stopped this device because it has reported problems. (Code 43)
Recommended resolution

One of the drivers controlling the device notified the operating system that the device failed in some manner.

If you have already run the Troubleshooting Wizard, you might want to check the hardware documentation for more information about diagnosing the problem.

Code 44

An application or service has shut down this hardware device. (Code 44)
Recommended resolution

Restart your computer

Click Start, click Shut Down, and then select Restart in the Shut Down Windows dialog box to restart the computer.

Code 45

Currently, this hardware device is not connected to the computer. (Code 45)
Recommended resolution

This error occurs if a device that was previously connected to the computer is no longer connected. To resolve this problem, reconnect this hardware device to the computer.

No resolution is necessary. This error code is only used to indicate the disconnected status of the device and does not require you to resolve it. The error code resolves automatically when you connect the associated device to the computer.

Additional information

If Device Manager is started with the environment variable

DEVMGR_SHOW_NONPRESENT_DEVICES

set to 1 (which means show these devices), any previously attached (NONPRESENT) devices are displayed in the device list and assigned this error code.

Code 46

Windows cannot gain access to this hardware device because the operating system is in the process of shutting down. (Code 46)
Recommended resolution

The device is not available because the system is shutting down.

No resolution is necessary. The hardware device should work correctly next time that you start the computer.

This error code is only set when Driver Verifier is enabled and all applications have already been shut down.

Code 47

Windows cannot use this hardware device because it has been prepared for safe removal, but it has not been removed from the computer. (Code 47)
Recommended resolutions

Reconnect the device

This error code occurs only if you used the Safe Removal application to prepare the device for removal, or pressed a physical eject button.

Reconnect the device to your computer

Disconnect this device from the computer, and then connect it again.

Restart your computer

Make sure that the device is connected correctly to your computer, and then restart your computer. Click Start, click Shut Down, and then select Restart in the Shut Down Windows dialog box to restart the computer.

Code 48

The software for this device has been blocked from starting because it is known to have problems with Windows. Contact the hardware vendor for a new driver. (Code 48)
Recommended resolution

Update the driver

Contact the manufacturer of your hardware device to obtain the latest version or the updated driver. Then, install it on your computer.

Code 49

Windows cannot start new hardware devices because the system hive is too large (exceeds the Registry Size Limit). (Code 49)
Cause

The system hive has exceeded its maximum size and new devices cannot work until the size is reduced. The system hive is a permanent part of the registry associated with a set of files that contains information related to the configuration of the computer on which the operating system is installed. Configured items include applications, user preferences, devices, and so on. The problem might be specific devices that are no longer attached to the computer but are still listed in the system hive.

Recommended resolution

Uninstall devices that you are no longer using

To resolve this problem, you should first try uninstalling any hardware devices that you are no longer using.

  1. Set up Device Manager to show devices that are no longer connected to the computer.
    1. Click Start, and then click Run.
    2. In the Open box, type cmd. The Command Prompt window opens.
    3. At the prompt, type the following command, and then press Enter:
      set devmgr_show_nonpresent_devices=1
  2. In Device Manager, click View, and then click Show hidden devices. You will now be able to see devices that are not connected to the computer.
    1. Select the device that you want to uninstall.
    2. On the device Properties dialog box, click the Driver tab, and then click Uninstall. Follow the instructions.
    3. Restart your computer.
  3. Uninstall the devices that you no longer need.
  4. Check the device Properties dialog box in Device Manager to see whether the error is resolved.

Code 52

Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. (Code 52)

Cause

The driver may be unsigned or corrupted.

Recommended resolution

Download the Troubleshooting Wizard to resolve the problem :

Fix Windows X3DAUDIO1_7.DLL

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DLL dependencies

When a program or a DLL uses a DLL function in another DLL, a dependency is created. Therefore, the program is no longer self-contained, and the program may experience problems if the dependency is broken. For example, the program may not run if one of the following actions occurs:

  • A dependent DLL is upgraded to a new version.
  • A dependent DLL is fixed.
  • A dependent DLL is overwritten with an earlier version.
  • A dependent DLL is removed from the computer.

These actions are generally known as DLL conflicts. If backward compatibility is not enforced, the program may not successfully run.

The following list describes the changes that have been introduced in Microsoft Windows 2000 and in later Windows operating systems to help minimize dependency issues:

  • Windows File Protection
    In Windows File Protection, the operating system prevents system DLLs from being updated or deleted by an unauthorized agent. Therefore, when a program installation tries to remove or update a DLL that is defined as a system DLL, Windows File Protection will look for a valid digital signature.
  • Private DLLs
    Private DLLs let you isolate a program from changes that are made to shared DLLs. Private DLLs use version-specific information or an empty .local file to enforce the version of the DLL that is used by the program. To use private DLLs, locate your DLLs in the program root folder. Then, for new programs, add version-specific information to the DLL. For old programs, use an empty .local file. Each method tells the operating system to use the private DLLs that are located in the program root folder.

DLL troubleshooting tools

Several tools are available to help you troubleshoot DLL problems. The following tools are some of these tools.

Dependency Walker

The Dependency Walker tool can recursively scan for all dependent DLLs that are used by a program. When you open a program in Dependency Walker, Dependency Walker performs the following checks:

  • Dependency Walker checks for missing DLLs.
  • Dependency Walker checks for program files or DLLs that are not valid.
  • Dependency Walker checks that import functions and export functions match.
  • Dependency Walker checks for circular dependency errors.
  • Dependency Walker checks for modules that are not valid because the modules are for a different operating system.

By using Dependency Walker, you can document all the DLLs that a program uses. This may help prevent and correct DLL problems that may occur in the future. Dependency Walker is located in the following directory when you install Microsoft Visual Studio 6.0:

driveProgram FilesMicrosoft Visual StudioCommonTools

Download Windows DLL Repair Tool

Repair Error x3daudio1_7 dll

Fix Module Memory Error x3daudio1_7 dll. For the Microsoft Windows operating systems that are listed in the “Applies to” section, much of the functionality of the operating system is provided by dynamic link libraries (DLL). Additionally, when you run a program on one of these Windows operating systems, much of the functionality of the program may be provided by DLLs. For example, some programs may contain many different modules, and each module of the program is contained and distributed in DLLs.

The use of DLLs helps promote modularization of code, code reuse, efficient memory usage, and reduced disk space. Therefore, the operating system and the programs load faster, run faster, and take less disk space on the computer.

When a program uses a DLL, an issue that is called dependency may cause the program not to run. When a program uses a DLL, a dependency is created. If another program overwrites and breaks this dependency, the original program may not successfully run.

With the introduction of the Microsoft .NET Framework, most dependency problems have been eliminated by using assemblies.
What is a DLL?

A DLL is a library that contains code and data that can be used by more than one program at the same time. For example, in Windows operating systems, the Comdlg32 DLL performs common dialog box related functions. Therefore, each program can use the functionality that is contained in this DLL to implement an Open dialog box. This helps promote code reuse and efficient memory usage.

By using a DLL, a program can be modularized into separate components. For example, an accounting program may be sold by module. Each module can be loaded into the main program at run time if that module is installed. Because the modules are separate, the load time of the program is faster, and a module is only loaded when that functionality is requested.

Additionally, updates are easier to apply to each module without affecting other parts of the program. For example, you may have a payroll program, and the tax rates change each year. When these changes are isolated to a DLL, you can apply an update without needing to build or install the whole program again.

The following list describes some of the files that are implemented as DLLs in Windows operating systems:
ActiveX Controls (.ocx) files
An example of an ActiveX control is a calendar control that lets you select a date from a calendar.
Control Panel (.cpl) files
An example of a .cpl file is an item that is located in Control Panel. Each item is a specialized DLL.
Device driver (.drv) files
An example of a device driver is a printer driver that controls the printing to a printer.
DLL advantages

The following list describes some of the advantages that are provided when a program uses a DLL:
Uses fewer resources
When multiple programs use the same library of functions, a DLL can reduce the duplication of code that is loaded on the disk and in physical memory. This can greatly influence the performance of not just the program that is running in the foreground, but also other programs that are running on the Windows operating system.
Promotes modular architecture
A DLL helps promote developing modular programs. This helps you develop large programs that require multiple language versions or a program that requires modular architecture. An example of a modular program is an accounting program that has many modules that can be dynamically loaded at run time.
Eases deployment and installation
When a function within a DLL needs an update or a fix, the deployment and installation of the DLL does not require the program to be relinked with the DLL. Additionally, if multiple programs use the same DLL, the multiple programs will all benefit from the update or the fix. This issue may more frequently occur when you use a third-party DLL that is regularly updated or fixed.
DLL dependencies

When a program or a DLL uses a DLL function in another DLL, a dependency is created. Therefore, the program is no longer self-contained, and the program may experience problems if the dependency is broken. For example, the program may not run if one of the following actions occurs:
A dependent DLL is upgraded to a new version.
A dependent DLL is fixed.
A dependent DLL is overwritten with an earlier version.
A dependent DLL is removed from the computer.
These actions are generally known as DLL conflicts. If backward compatibility is not enforced, the program may not successfully run.

The following list describes the changes that have been introduced in Microsoft Windows 2000 and in later Windows operating systems to help minimize dependency issues:
Windows File Protection
In Windows File Protection, the operating system prevents system DLLs from being updated or deleted by an unauthorized agent. Therefore, when a program installation tries to remove or update a DLL that is defined as a system DLL, Windows File Protection will look for a valid digital signature.
Private DLLs
Private DLLs let you isolate a program from changes that are made to shared DLLs. Private DLLs use version-specific information or an empty .local file to enforce the version of the DLL that is used by the program. To use private DLLs, locate your DLLs in the program root folder. Then, for new programs, add version-specific information to the DLL. For old programs, use an empty .local file. Each method tells the operating system to use the private DLLs that are located in the program root folder.

DLL dependencies

When a program or a DLL uses a DLL function in another DLL, a dependency is created. Therefore, the program is no longer self-contained, and the program may experience problems if the dependency is broken. For example, the program may not run if one of the following actions occurs:
A dependent DLL is upgraded to a new version.
A dependent DLL is fixed.
A dependent DLL is overwritten with an earlier version.
A dependent DLL is removed from the computer.
These actions are generally known as DLL conflicts. If backward compatibility is not enforced, the program may not successfully run.

The following list describes the changes that have been introduced in Microsoft Windows 2000 and in later Windows operating systems to help minimize dependency issues:
Windows File Protection
In Windows File Protection, the operating system prevents system DLLs from being updated or deleted by an unauthorized agent. Therefore, when a program installation tries to remove or update a DLL that is defined as a system DLL, Windows File Protection will look for a valid digital signature.
Private DLLs
Private DLLs let you isolate a program from changes that are made to shared DLLs. Private DLLs use version-specific information or an empty .local file to enforce the version of the DLL that is used by the program. To use private DLLs, locate your DLLs in the program root folder. Then, for new programs, add version-specific information to the DLL. For old programs, use an empty .local file. Each method tells the operating system to use the private DLLs that are located in the program root folder.

DLL development

This section describes the issues and the requirements that you should consider when you develop your own DLLs.
Types of DLLs

When you load a DLL in an application, two methods of linking let you call the exported DLL functions. The two methods of linking are load-time dynamic linking and run-time dynamic linking.
Load-time dynamic linking
In load-time dynamic linking, an application makes explicit calls to exported DLL functions like local functions. To use load-time dynamic linking, provide a header (.h) file and an import library (.lib) file when you compile and link the application. When you do this, the linker will provide the system with the information that is required to load the DLL and resolve the exported DLL function locations at load time.
Run-time dynamic linking

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When you use run-time dynamic linking, you do not need an import library file.

The following list describes the application criteria for when to use load-time dynamic linking and when to use run-time dynamic linking:
Startup performance
If the initial startup performance of the application is important, you should use run-time dynamic linking.
Ease of use
In load-time dynamic linking, the exported DLL functions are like local functions. This makes it easy for you to call these functions.
Application logic
In run-time dynamic linking, an application can branch to load different modules as required. This is important when you develop multiple-language versions.

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