I've had this problem before when I reformatted my computer awhile back and I just freshly reformatted it again. Problem is, I don't remember where to download my driver to fix. My audio comes from a built in sound card. In my device manager I have a exclamation mark beside Multimedia Audio Controller and RAID Controller but I'm sure the RAID doesn't have to do anything to do with the sound. Still would like it fixed if possible.