Game, i'm gonna to check when I get home and verify that. I'm at work right now and Nero is not installed on this pc. It does sound like you're doing the right thing.
The other thing that popped in my mind is that you have a bad burn or a corrupt ISO. There's a utillity that will check the integrity of the ISO file, called MDK checksum? or soemthing similar.... should have been a link to it on the same website you D/Led the ISO files from.