Repair install of Windows fixed it. Thanks.

Tried it, but nothing changed. I found that Multimedia Class Scheduler is missing from Services. My system can't find mmcss.dll. I read that this process is critical for audio, but it seems to be...

I had perfect audio yesterday. Today I don't think I changed anything, but I don't have audio anymore. At first I had a red X over the tray icon and got an error saying that the audio service wasn't...