Which operating system are you using?

Are these movies from copyrighted disks? Personal home movies? Downloaded files from a website? Some other type?

What formatting is used for the recorder and the media? Do both match with DVD+ or DVD-?

What file type are the movies and how are you burning them? Are these simply "data disks" which burn the physical file to the disk? DVD disks required DVD formatting to actually play as a DVD.

Please give us any EXACT error messages seen.

Hope this helps.