Problem with playing a dvd...

When I select the dvd drive from the video playlist and select the dvd movie, the movie starts up playing no problems but there is no sound! I've tried unmuting all the lines on my audio (using an MII1000 board) but no luck. I'm also using the Nvidia decoders. Anyone have any suggestions?

FIX:

Yeah so I guess the Nvidia decoders didn't like median engine on my machine because the sound was working when playing in Windows Media Player.

I just uninstalled Nvidia decoders and installed PowerDVD software...works great now!:o