The best process would be :
Activate AnyDVD or DVDGenie or some other program first hand (IF you want this)
Open your dvd rom tray and put in the original dvd
Close it and STOP the disc from autplaying
Activate dvd playback software and playback a little movie. This will help to unlock the files on the dvd media.
Set dvd playback software on PAUSE and minimize it.
Activate your dvd backup tool. DVDShrink , Decrypter , whatever
The process begins and you have a nice map on your harddisk where the movie is backupped. In this map there should be two maps , AUDIO_TS and VIDEO_TS
Close your dvd backup tool , close your dvd playback software , close your anydvd/dvdgenie.
Activate your writing program. Nero , CloneDVD , whatever.
If necessary, select DVD Video as the writing standard AND if possible , select Book Type.
Drag both AUDIO_TS and VIDEO_TS folders on the root of your dvd preparation. (Nero already makes those folders for you , you just need to drag all the files in them). It's very very likely that the AUDIO_TS folder is empty , but there MUST be an AUDIO_TS folder on your dvd disc !!
Write and verify