I have a question about virtual sound cards.

I love tunebite and I have a computer that I want to re-record the songs into mp3. The computer doesn't have a sound card though. I was able to fool Windows with a RigExpert virtual sound card, but tunebite won't get past the sound card testing step on installation. Do I need to have a physical sound card in the computer in order to convert? I want to use tunebite on that computer, and then listen to the songs on another computer that I use for work (I don't want this computer to be cluttered with Yahoo's music program and tunebite running all day).

Any help is appreciated.
Thanks