About a week ago after running the disk clean up utility,i lost all audio,since then i have cheched that nothing is muted,unplugged the speakers but still no sound,did a ystem restore and still nothing,iwent to the device manager and updated the drivers still nothing,and when i say no audio i mean no audio at all not even system sounds,i have a realtek ac 97 soundcard,is this a common problem,shuold i upgrade the sound card or is there a solution for it?