Movie Maker
Microsoft Movie Maker is a digital video editing program that allows you do do exactly what the name says - make a movie. Here are a number of helpful documents that will help you with the process, from preproduction advice to saving the movie to a CD.
Before you begin working on your movie, check this out, it may save you some time when you start to edit.
Check out this basic tutorial for more information on how to use Movie Maker.