Sometimes you get an error message that says “X3DAudio1_7.dll is missing” . I will fix it for you .
If you experience issues in which an application fails because of the missing file X3DAUDIO1_7.DLL, you may be able to resolve the failure by running the DirectX run-time package.
I would suggest you to download the the Runtime Package and then installing it.
Also, you can diagnose basic problems with DirectX
Tag : How to fix “X3DAudio1_7.dll is missing” error