Aren't you trying to burn copy protected material?
If so, first you need to decrypt it. To do this try using Alcohol products, available at http://www.alcohol-soft.com. You can download a trial version.
You can try also SlySoftware's AnyDVD at http://www.slysoft.com, to decrypt the copy protected material. You can download a trial version.
You will need also a good copy program. You can try SlySoftware's CopyCD at http://www.slysoft.com. You can download a trial version.