Since no one else has given you any feedback....I'll give it a shot.
Make sure you have the latest firmware and/or drivers for your drive. Could possibly be a driver problem.
Try burning your video to the hard drive instead of straight to a disc from DVD Architect. Then use a different program (Nero, Roxio) to burn the actual DVD. If it burns with the other program, then you will know it is a problem with DVD Architect. If it happens with the other programs also, you'll know it's the drive.
Possible bad drive. Hardware can and often does go bad.