For anyone wanting to help......... it would be good to know some particulars, like:
What computer? (Desktop or laptop.)
What speed are you trying to burn at?
Have you used the same burner and software under XP, Vista or win-7?
Always remember, "A slower burn is a better burn".
I use only two programs for burning DVD's on my computer.
"Nero", which I've used like, , , FOREVER!
and "ImgBurn" which I only use for burning .ISO files to CD or DVD.
It also works great for making an ISO off of a CD or DVD.