
It’s important, however, not to download DLL files from online sources, such as websites and forums, or from other sources you don’t trust. This could be another PC you own or, if possible, from a friend or family member. If you’re missing the d3dx9_43.dll file (for whatever reason), you may be able to restore your gameplay manually by copying the missing file from another Windows 10 PC. One missing file is enough to create problems with DirectX-powered games. A fresh installation might seem drastic but, if all else fails, it may be your only option.

If it doesn’t work, you may need to consider more drastic repair attempts, such as restoring your PC using System Restore or by wiping and reinstalling Windows. After restarting, check that your DirectX installation is working properly by running the game or application that initially caused the “d3dx9_43.dll missing” error. Once the DISM and SFC tools are finished, close PowerShell and restart your PC.

For example, if you have DirectX 11 installed, but your game requires DirectX 12, you may see this error or similar errors, such as a dxgmms2.sys BSOD, appear.
