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D3D9.dll Error Repair Tutorial – How To Fix The D3D9.dll Error On Windows

D3D9.dll is an important component that belongs to the DirectX 9 software. It is designed specifically to enable DirectX functionality for various Windows games and many other types of multimedia applications.  This file significantly enhances your gaming and multimedia experience in your PC.  The error notifications surrounding this file are generally brought about by the difficulty of Windows in reading the file.  This tutorial will teach you how to repair the errors on your PC.

What Causes d3d9.dll Errors?

The different d3d9.dll error notifications will typically appear on your screen in these formats:

  • ?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?

Many of these errors are displayed when you have older versions of DirectX on your computer.  Usually, the errors appear because the program that you are attempting to use is specifically designed to run using DirectX 9, but you instead have the DirectX version 8 installed on your PC.  Some other common causes of these irritating error messages appearing are damaged or corrupted settings, missing or misplaced files and registry problems which leave Windows not able to read or load the file properly.  You need to accurately identify the source of the problem and repair this to fix the errors on your system ? Follow the steps outlined below to get to the root of things:

How To Fix d3d9.dll Errors

Step 1 ? Update To The Latest Version Of DirectX

The most common cause of the problem is having an out-of-date version of DirectX in your computer.  The d3d9.dll works with DirectX version 9 only and you need to update your DirectX programs to this latest version to ensure that your PC will run smoothly and without errors.  If you are not certain which version of DirectX is installed on your computer, follow these steps:

  1. Click Start and select the Run command.
  2. In the dialogue box that appears, type ?dxdiag? and press ?Enter? to make the DirectX Diagnostic Tool window appear.
  3. You can verify the specific DirectX version installed on your PC by looking at the bottom part of the window.

You need to download the DirectX 9 version from the Internet and overwrite the older version by installing the latest copy.  This process will usually make the error messages vanish.  However, if the error messages persist on your computer, proceed to the next step.

Step 2 ? Locate & Replace The Missing File

Replacing the d3d9.dll file manually on your hard drive and then registering it on Windows is probably the best way to ensure that the file will work properly and be read by Windows correctly.  Here?s how to do this:

  1. Download from the Internet using this link
  2. Unzip the d3d9.dll file onto your computer?s hard drive
  3. Browse to c:\Windows\System32
  4. Locate the current d3d9.dll on your system
  5. Rename the current d3d9.dll to d3d9BACKUP.dll
  6. Copy & paste the new d3d9.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 d3d9.dll? on the black screen

This process will install a fresh copy of the dll file and will prevent the error messages from showing again.  However, if there are other problems present in your system, the error messages may continue to appear.  You need to proceed to the next step.

Step 3 ? Clean Out The Registry

The registry is often identified as the source of d3d9.dll errors on computer systems. It actually causes many other problems besides the d3d9.dll errors and you will notice this when your computer run very slowly.  The registry is an important module which serves as a central database for all the settings and options for files and programs saved in your hard drive.

Windows needs to access these settings to remember how you want your programs and files to load and run.  However, due to the way Windows saves the registry keys and its constant accessing of multiple registry entries at the same time, the settings can become damaged or corrupted, producing lots of problems in the registry including the different d3d9.dll errors.  You need to repair the registry keys to resolve issues inside the registry which you can do by using a registry cleaner. This is a tool that can effectively perform scans to identify broken registry entries and repairs them.

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