If you are trying to runa a game and get into this missing .dll:
(Missing X3DAudio1_7.dll)
- Try to install DirectX End-User Runtime Web Installer
download link or just search for it.
https://www.microsoft.com/en-us/download/details.aspx?id=35
restart
How to find it:
- Press: window Key and R
- Type dxdiag in the text bar. click OK or hit Enter