Or something. What program(s) would I need to take out parts of a video file to make a new video file that is made of those parts? I'm basically asking this because I want to take the ending theme song out of a video file I have and make one video file with the theme song. If that makes sense. So yes. Please help the computer-illiterate.

Edit: Regarding Windows Movie Maker, it won't allow me to import AVI files for whatever reason.