Windows Movie Maker Audio Only (Codec Problem?)

I recently bought a computer with Vista on it, and have been attempting to use Windows Movie Maker. It allows me to import the videos that I made on my old computer, but when I try to import new videos, or videos that worked on my old computer, they become audio only. When I try to drag the clip down into the timeline to edit it, it goes into the audio/music section. I have the updated divx and xvid codecs, I think, and the cccp, which worked for me in the past. Any advice?

Thanks in advance.

 

Well gee, LadyBrock, I really don't know.

But I'm sure someone here will be able to help you.

They're the best!