If you are making movie dvds you want something that can make menus and stuff aswell.
http://dvdstyler.org/en/ is free and very good, though it may be hard to pick up and learn, maybe try youtube for tutorials or something.
Also if you have windows vista/7 you can type "windows dvd maker" into the search bar, or just go to programs and it will be near the top not in a folder. You can make dvds with that, but you cant really do to much customization with it.