I think you can download a trial version at their site, or something.

With Windows Movie Maker, all you can do is line up the clips and put some background music in. On the other hand, it's easy to use...

And about the Sephiroth movies, if you find someone with the PC version of FFVII, you can search through the FMV's of that. If you can't find that, look to Kazaa for all your FMV needs.