Where are you trying to copy the information from? Are you burning from a folder on your hard drive, or from another DVD? What DVD Burner are you trying to use, to do the burning?
In either case, take a look at this page of mine to see if you can find your answer.
If not, then e-mail me direct at eric.groves COLOR=Red verizon.net [/COLOR] and I'll try to offer more assistance.