Hi Jeff,
It is not clear to me what kind of device you are using,
Is it a TV tuner on your ATI video card (ALL-IN-WONDER)? Or a Sony provided video card? Or a third party card?
If it is a Sony device that came with your VAIO machine, then it is not supported, at least not until Sony has drivers that fully conform to Microsoft DirectShow.
If it is a ATI ALL-In-Wonder, depending on model, it may have an audio out that you must connect to Line-In of your sound card. If there is no Audio Out, you must tell MC TV program about it (TV Configuration->Audio tab, uncheck the checkbox that says "This device requires a cable ...") because by default the program assumes there is a cable connection.
If it is a third party card, mostly it should be similar to ATI. If it does not work, let us know the manufacturer and model.
Yaobing