This problem started when I accidently allowed a Vista update on my computer.  I tried resetting the computer to an earlier date to get the sound back.  Resetting the computer destroyed it.  I took the computer in to get it reformatted, it works now, but still no audio.  I tried updating the drivers, but the system says the drivers are up to date.  I tried disabling the audio and rebooting the computer, still no audio.  Computer is worthless to me without audio, half the reason I have it is for sound manipulation.  Can anyone please help me?  Do I have to buy a new sound card?  New motherboard?  What do I have to do to get sound capability back?