The d3dx9_25.dll file is one of many files that are part of the DirectX software collection. D3dx9_25.dll errors usually appear when a software program that uses DirectX cannot find or use that DLL file correctly.
How to Fix Can't Start Program D3DX9_25.dll is Missing on Computer Windows 10/11/7 32/64bit
If restarting your computer does not resolve the issue, try the following solutions in the order presented until the issue is resolved:
Install the latest version of Microsoft DirectX. Upgrading DirectX will fix most d3dx9_25.dll errors.
Install the version of DirectX that came with the program. Look for a DirectX installer on your game or application CD or DVD.
