Why won't my DVD drive burn my movies?

Ok, here's my problem. I was trying to make a movie for my parents (cause they're completely computer illiterate) and the burning gets about half way done then fails. I've tried two different programs to burn it and the first one says that it completes, but there's nothing on the disk, and the second one says there was an error that was most likely caused by bad media (the blank dvd). I know the dvds are fine cause they burn just fine on my other computer just not this one. Any tips/advice would be most appreciated.