I have a media center 2005 pc and it was working great up until about 1 month ago.  I have a sound blaster extigy external usb sound card that I am using for optical audio recording when a tv show is recorded.  I have my directv receiver connected to the media center via s-video and optical audio.  About 1 month ago, I moved the extigy to a different computer.  I have now moved it back to the original media center 2005 pc.  When I record a tv show, I get video but no audio recorded.  My default recording device in Windows is set to the Extigy.  Is there any other setting that I need to make to tell Windows Media Center to record from the Exigy device?

Edit:  It looks like the extigy has an spdif bypass mode that I need to disable.  Does anyone know how to do this?