How to Fix D3dx9_42.dll Not Found or Missing Errors

D3dx9_42.dll issues are caused in one way or another by an issue with Microsoft DirectX.

The d3dx9_42 DLL file is one of many files contained in the DirectX software collection. Since DirectX is utilized by most Windows based games and advanced graphics programs, these errors usually show up only when using these programs.

D3dx9_42 Errors

There are several ways d3dx9_42.dll errors can show up on your computer. Here are examples of the more common ones:

• D3dx9_42.dll not found. Reinstalling might help fix this
• D3dx9_42.DLL Not Found
• File d3dx9_42.dll not found
• The program can't start because d3dx9_42.dll is missing from your computer. Try reinstalling the program to fix this problem.
• The file d3dx9_42.dll is missing

These errors appear when a game or ​another software program is started, so it could apply to any program that utilizes Microsoft DirectX, like Autodesk's Maya or any other software program. However, d3dx9_42 DLL errors are most commonly seen when attempting to play video games.

Some examples of video games that have been known to show the error when there's a problem with DirectX include Rocksmith, Sid Meier's Civilization V, ArcheAge, State of Decay, Batman, The Lord of the Rings Online, Need for Speed Hot Pursuit 2011, The Legend of Pirates Online, F1 2010, Street Fighter, and Assassin's Creed.

How to Fix D3dx9_42.dll Errors

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

1. Restart your computer if you haven't yet done so. The d3dx9_42.dll error might be a fluke and, like many computer issues, a simple restart could clear it up completely.

2. Install the latest version of Microsoft DirectX. Chances are, upgrading to the latest edition will fix the error d3dx9_42.dll not found.

   Microsoft often releases updates to DirectX without updating the version 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 you're receiving, look for a DirectX installation program on your game or application DVD or CD (it might be called dxsetup or something similar).

   Usually, if a game or ​another program utilizes DirectX, the software developers will include a copy of it on the installation disc. Sometimes, though not often, the version included on the disc is a better fit for the program than the latest version available online.

   Ubisoft provides a solution to the d3dx9_42.dll error if you're getting it in Assassin's Creed: Revelations. You can adapt those directions for your program or game.

4. Uninstall the game or software program and then reinstall it again. Something might have happened to the files in the program that work with d3dx9_42.dll, and a reinstallation could do the trick.

   Sometimes, the standard uninstallation wizard for some programs and games don't remove every single trace of the program's files from the drive and registry, which might be causing additional issues or prevent the DLL from properly being used later. Try a free uninstaller program instead to be sure it all gets deleted.

5. Restore the d3dx9_42.dll file from the latest DirectX software package. If the above troubleshooting steps haven't worked to fix the issue, try extracting the DLL file individually from the DirectX downloadable package.

6. Update the drivers for your video card. While it's not the most common solution, in some situations, updating the video card drivers could correct this DirectX issue.

Need More Help?

If you don't want to fix this problem yourself, see How Do I Get My Computer Fixed? for a full list of your support options, plus help with everything along the way like figuring out repair costs, getting your files off, choosing a repair service, and a lot more.