Have you tried Windows Live Movie Maker?
Usually, the DVD burner program that came with Windows 7 does a good job with that.( Windows DVD Maker is the official name)
Do your friends have a DVD player. Can you take your finished disc to an electronics store and try it there?
DVD players are so inexpensive ( but don't get those "Discman" sized players) get something from a "name" manufacturer. There really is no excuse for NOT having one!
Could you please post a picture that represents just HOW contrasty an effect that you are looking for?