I have a Media Center PC with an onboard sound controller, called C-Media AC97 Audio Device. I see a Digital Output device in Control Panel -> Sound. But when I choose that output device in the volume mixer, it says that there is no device.

Does anyone know what I need to do to get the digital output device work for this sound controller? I run Vista RC1, and don't even have Windows XP Media Center installed anymore, so now I'm stuck with the poor analog sound quality. [C]