Read this http://forums.afterdawn.com/thread_view.cfm/261221 Should be of help to you. If there's anything you don't understand post back and I will help you further.
you must have had a problem when ripping the DVD to the hard drive and then Nero couldn't follow the DVD structure! Try re ripping the DVD again then use Nero again. good luck.
Yeah, but use a diff program to rip it... cos the one you used before is the one you are having problems with...