I installed Xulu, but when I tried to run it, I got an error message similar to “XAudio2 failed to initialize with code -2147221164.” What can I do to fix this?

This error occurs when a part of the DirectX package fails to install correctly. The quickest and easiest way to fix this is to download the entire DirectX redistributable from Microsoft. Just use this link and look for the newest “DirectX End-user Runtime update.”