Listens: Everybody Loves Raymond

VLC Media Player Problems.

I used to have this clunker of a desktop, and I used VLC on it to do all my capping for icons. But I recently got a new laptop, and I've been trying to reinstall all my old programs.
So, I got VLC, and installed, and I've been having some problems using it now.
When ever I start a video file [a DVD or a downloaded .avi] the video doesn't show up, and I only get the sound. Does anyone know what driver I'm missing, or what could possibly be wrong?

-*edit*- also, the new computer has vista, if that matters.