Since you are posting in the AnyDVD Forum I am assuming that you are using the AnyDVD-CloneDVD combination. You mention DVD Decrypter in you posting. You either use AnyDVD or DVD Decrypter but not both at the same time. Using DVD Decrypter in conjunction with AnyDVD can cause conflict issues.
Suggest visiting SlySoft (http://www.slysoft.com) and download the latest versions of AnyDVD and CloneDVD.
The AnyDVD-CloneDVD combination has been used many times to make a back-up copy of National Treasure without any problems.
From the limited information you have provided I am assuming that your problem is a DVD media incompatibility problem between your DVD Burner and the particular DVD media you are using.
Suggest viewing the below posting concerning DVD media incompatibility problems.