Can anyone tell me how easy or hard it is to edit and create a DVD from a video on computer that has Windows Vista?

First step would be to try Windows Movie maker, it's quite good!

How to Make/Edit a movie with Windows Movie Maker in Windows Vista :: the How-To Geek (http://www.howtogeek.com/howto/uncategorized/how-to-makeedit-a-movie-with-windows-movie-maker-in-windows-vista/)