I use Ulead Movie factory 2.0 to author movie. It has a shareware version on download.com. It a little stripped down from the full version and you have to uninstall and reinstall after 30 days but it works very well and requires less system resourse and resolution than the full version. Great program for DVD burning beginers. http://download.com.com/3000-2194-10183920.html
Still convert your movies 1st with TMPGenc. That makes things easier. It's free and pretty much the best converting tool out there asided from expensive conversion cards. http://www.tmpgenc.net/e_main.html