Dxdx9_31.dll Error Repair – How To Repair DirectX DxDx9_31.dll Errors On Windows

D3dx9_31.dll is a file component within the DirectX version 9. It is used by Windows to load DirectX functionality to all games and multimedia programs that require DirectX to be loaded onto your system.  This file generally shows errors on your screen as a result of the system not being able to read the file properly, either because the file is damaged, corrupted or has somehow gone missing. You need to resolve issues with this file to fix the problem. This tutorial will teach you how to easily repair DirectX dxdx0_31.dll errors on your PC.

What Causes dxdx9_31.dll Errors?

Dxdx9 31.dll errors are displayed as one of these messages:

  • “Cannot initialize dinput9.dll”
  • “Fatal Exception error in dplayx.dll”
  • “dplay.dll has performed an illegal operation”
  • “Access violation error in DirectX file D3D8.DLL”

The different dxdx9_31.dll errors are all primarily caused by the file being rendered unusable, which leads to a huge number of potential issues if it is not rectified.  The errors can also be caused by simply running an outdated version of DirectX, or even issues inside the registry.  You can fix the problem by identifying the cause and repairing the error – How to do this is shown in the following steps below:

How To Fix dxdx9_31.dll Errors

Step 1 – Update To The Latest Version Of DirectX

Many of the related errors are caused by having an older version of DirectX.  Many of the games and multimedia applications that have been released in the last few months are configured specifically for DirectX 9, and so when you try to run them with DirectX 8 or any of the older versions, the error message will pop-up on your screen and prevent you from using that application. You need to download the latest version of DirectX and install it onto your PC to ensure that your computer will run smoothly. You need to check the version of the DirectX program you have installed on your PC by applying these steps:

  1. Click Start and then select Run.
  2. Type dxdiag in the box that appears and press “Enter” to open the DirectX Diagnostic Tool window.
  3. In this window, you can verify the DirectX version installed on your PC by looking in the bottom part of the window.

After verifying which version of DirectX you have, if it is not the latest version, go to the Microsoft website and download the latest update for this program.

Step 2 – Locate & Replace The Missing File

If you are updated to version 9 yet still seeing problems, it may be that the file itself is having problems. Manually replacing the dll file will ensure that Windows has a fresh and working file to read. You can replace the dxdx9_31.dll file by following these simple steps:

  1. Download dxdx9_31.dll from this link

  2. Save the dxdx9_31.dll file onto your computer’s hard drive
  3. Browse to c:\Windows\System32
  4. Locate the current dxdx9_31.dll on your system
  5. Rename the current dxdx9_31.dll to dxdx9_31BACKUP.dll
  6. Copy & paste the new dxdx9_31.dll into C:\Windows\System32
  7. Click Start > Run (Or search”run” on Vista & Win7)
  8. Type “cmd” in the box that appears
  9. Type “regsvr32 dxdx9_31.dll” on the black screen

If the error message still shows on your screen, it is time to clean out your registry.  You need to proceed to the next step.

Step 3 – Clean Out The Registry

The registry is potentially the biggest source of dxd9_31.dll errors, as well as a host of various system problems.  Windows needs to access the registry to load the different settings and options of your files and programs in order to remember the way you have set them to be loaded and executed.  Despite the significance of the registry in the smooth operation of your system, it is also a big problem area. It is continually being plagued with errors because Windows loads multiple registry keys at the same time and often saves these in the wrong way. You can clean out your registry by using a “registry cleaner” application to scan your system in accurately detecting and fixing damaged keys inside the registry.

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Most DLL errors are caused by the "registry database" of Windows.
This is a storage facility for all the files, settings and options that Windows uses to help it run. The problem is that there is a large list of DLL files your software uses to run - this list is highly important but is continually being damaged, causing the errors you're seeing. You can easily fix this problem by using a "registry cleaner" program to repair any registry errors your system has.