Welcome to the forums.
Is the exact format of your movies dvd-video, or is it something else that you simply burn as data to a blank dvd disc? DVD-video consists of .ifo, .bup and .vob files within a Video_TS folder, often accompanied by an empty Audio_TS folder.
If they are dvd-video, is it possible to save to the hard drive and use another program to do the actual burn to a disc? If that is possible, I would recommend doing a test burn. Download and install a burning program called ImgBurn. www.imgburn.com
If you need instructions on how to burn dvd-video folders to a disc using ImgBurn, here is a tutorial: http://forum.imgburn.com/index.php?showtopic=4632