I searched and didn't find this problem so I figure I'll either be proven wrong or possibly helped out

My problem is that after an unspecified period of time, I lose all sound. Occasionally I get a loud beep, but no desirable audio. Sometimes it turns back on; again without any obvious reason. I found one game that managed to sorta force audio. Sound would cut then come back really quickly. My only option is to reboot. Any ideas?
justin
I'm running xp home with an Audigy Card.