if you have realtek audio (alc650/850) onboard sound, there are new drivers out. (v3.76)
Maybe give them a try, work fine for me.
Uninstall old drivers first + set a system restore point if you´re on XP.
http://www.realtek.com.tw/downloads/...&Software=True
if you know how to do, activate the bluescreen in winXP (instad of instand reboot crash behavior)
My english is too poor to explain how to do, maybe another user could help here.
The bluescreen maybe contains useful information for debugging.