So here's the deal, my sister's boyfriend installed Avast Virus Scanner on her PC (after removing Symantec's Antivirus (Corporate / 10.x)) and her sound stopped working. So I started looking and tried reinstalling her sound drivers Realtek AC'97. Her PC reset every time it started to finalize the installation. :S Weird. So I completely disabled that sound card (It's integrated), and installed a Creative one that I had laying around. No cigar, still giving 'Device not working' error (or something like that). :S So I made a guess and decided to try a fresh windows install, on a different HDD I had laying around, and the sound works. The main problem is, I really don't want to have to deal with re-installing/transferring all of her crap, into a new install (I'm not letting her keep that HDD), and having to help her set everything up. I guess I could try uninstalling Avast's Antivirus, but in case that doesn't work, does anyone else have any suggestions?