I just recently installed the Sony DRU500A. Everything was fine for a couple of days, now I have the following problem. My computer has no sound unless POWERDVD is running. This includes system sounds, Media Player playback of mp3's, avi's, etc. They all work fine as long as POWERDVD is up but when its not running, I get nothing. I have checked the Device Manager for conflicts/enabling and followed the sound troubleshooting guide, my driver for my sound card is current. It seems that this ocurred when I first played a dvd in my DRU500A. I have also checked to make sure nothing is muted in the audio controls.

Please help me.