How to fix a "X3DAudio1_7.dll is missing" error for DirectX11?
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
Let us know if it helps. If the issue persists, we would be happy to help you further.