Every Microsoft operating system since Windows 98 can be affected by d3dx9_34.dll and other DirectX issues. This includes Windows 11, Windows 10, Windows 8, etc.
How to Fix d3dx9_34.dll Error in Windows 11
Follow these steps in the order they are described so that you can try the simpler solutions first.
Restart your computer if you haven't already done so.
The d3dx9_34.dll error may be a one-time issue and a reboot may resolve it. This approach is unlikely to fix the issue, but a reboot is always a good first step in troubleshooting.
