From: YoHoJo
Restart.
or
Download Latest Driver for you soundcard.
(Right click my comptuer, Hardawre Tab> Device Manager, and find your soundcard name. Then just google soundcardname + driver download) and you should find something.
BUT! BestBuy can do it for you pretty cheap: http://www.villavu.com/forum/showthread.php?t=51753&highlight :D!
Yes that would be step one.
If that still fails to work, I suggest you revert your Soundcard back to its factory version and update it after doing so.
Step-by-Step:
1. Right-Click My Computer > Select the Hardware Tab > Click Device Manager > Click the + Sign on: "Sound, Video, and Game Controllers > Double-Click your Sound Card > Driver Tab > RollBack Driver
2. Restart Computer
3. Do the Same method again EXCEPT after "> Driver Tab >" click the "Update Driver" Option and it should update
4. Finally, Restart your computer again, and it should work just fine.
=]