|When your soundcard is playing a song, and for some reason the singer sounds bad...then your soundcard is bad since it can't mimic the singer correctly anymore ;-) lol jk|
Now on a serious note...
Do you have a sound card in a pc slot? Or is this on-board sound?
Un-install the sound card in device manager, and reboot. Then install the sound drivers again.
If it's a soundcard in a pci slot, try switching it to a different pci slot. If it's onboard, check bios to see that the sound is enabled, and then reinstall drivers.