For some reason, when I try to burn a DVD using Nero, the original file shows around 650-700MB in size, then when I add it to Nero it shows over 800MB which doesn't fit on the DVD disc. Also, when I tried to burn it anyway, it did the encoding part, then went and said I required a CD-R disc to burn the movie, and wouldn't let me burn it to a DVD-R disc. I've tried 2 different types of video files, an AVI and a DIVX and they're both doing the same thing. Anything you guys can do to help so I can burn these movies?