Windows 10 2004 Update Break Your Audio? Conexant HD SmartAudio 221 for me. Try This.
I think I researched why this affected the HD audio drivers ability to function correctly and like all things I forget 7 minutes later. But hell, some of my dumb videos have helped a few people so why the hell not share it whether or not my explanation is useless.
Fixes Conexant Audio for me at least.