Troubleshoot & Solve Your Computer’s d3dx9_40.dll Absence Issues Easily

Any of Microsoft’s operating systems since Windows 98 might be affected by d3dx9_40.dll and other DirectX problems. This includes Windows 11, Windows 10, Windows 8, etc.

Disclaimer: This post includes affiliate links

If you click on a link and make a purchase, I may receive a commission at no extra cost to you.

How to Fix D3dx9_40.dll Errors

Follow these steps in the order they’re given below to try the simpler solutions first.

Do not download d3dx9_40.dll individually from any “DLL download site.” It’s usuallynot recommended to download a DLL file like that . If you already have, remove it immediately from wherever you put it and continue with these steps.

1. Restart your computer if you haven’t yet. The d3dx9_40.dll error might be a fluke and a simple restart could clear it up completely.
2. Install the latest version of Microsoft DirectX . Chances are, this will fix the “d3dx9_40.dll not found” error.
   Microsoft often releases updates to DirectX without updating theversion number or letter, so be sure to install the latest_release_ even if your version is technically the same.
3. Assuming the latest DirectX version from Microsoft doesn’t fix the error, look for a DirectX installation program on your game or application CD or DVD. Sometimes, though not often, the version included on the disc is a better fit for the program than the latest version available online.
   Usually, if a game or​ another program uses DirectX, the software developers will include a copy of DirectX on the installation disc. For example, if you’re using the game withSteam , it’s probably called_DXSETUP.exe_ , and can be found in a_redist_ folder in the game’s installation directory. If you can’t find it manually, try searching your entire computer for “dxsetup.exe” using a file search tool likeEverything .
   Another example is the GB-ASManager program. When the DLL error is seen there, reinstall the software included on the associated DVD.
4. Uninstall and then reinstall the game or software program . Something might have happened to the files in the program that work with d3dx9_40.dll, and a reinstallation could do the trick.
5. Restore the d3dx9_40.dll file from the latest DirectX package. If the above troubleshooting steps haven’t worked to solve your d3dx9_40.dll error, try extracting the file individually from the DirectX package.
6. Update the drivers for your video card. While it’s not the most common solution, in some situations, updating the video carddrivers in your computer could correct this DirectX issue.

How to Fix a Computer That Won’t Turn On

Causes of D3dx9_40.dll Errors

D3dx9_40.dll problems source from an error with Microsoft DirectX. ThisDLL file is one of many contained in the DirectX software collection. Since the software is used by games and advanced graphics programs, d3dx9_40.dll errors usually show up only when using these programs.

There are several ways d3dx9_40.dll errors can reveal themselves on your computer. Here are several of the more common messages you might see:

• D3DX9_40.DLL Not Found
• The file d3dx9_40.dll is missing
• File d3dx9_40.dll not found
• The program can’t start because d3dx9_40.dll is missing from your computer. Try reinstalling the program to fix this problem.
• D3dx9_40.dll not found. Reinstalling might help fix this.
• The code execution cannot proceed because d3dx9_40.dll was not found.
• Your system appears to be missing D3DX9_40.dll

The error message could apply to any program that uses Microsoft DirectX, but it’s most commonly seen in video games, including_Need for Speed_ ,Gothic ,Total War , and_Psychonauts_ .

Was this page helpful?

Thanks for letting us know!

Get the Latest Tech News Delivered Every Day

Subscribe

Tell us why!

Other Not enough details Hard to understand

Submit

Also read: