I recently had problems when burning a DVD on a friend's computer (I was showing them how to do it!
) Since I had installed Nero on their computer and knew that it did not contain InCD, and they also did not have the Roxio suite, I looked and found that the store which had sold the computer to them had installed a program with a silly name I now can't quite recall -- it was like 'Keith's Drag'n Drop. I removed it, and the burner drive then had no difficulty burning the DVD.
(Need not reply - have one myself 
)