DVDFab HD Decrypter should work with most any dvd you can throw at it. You have the latest version?
If you are sure it isn’t working, try the free trial for AnyDVD as advised before. Use the built in ripper in AnyDVD to get the full movie to the hard drive (right click on the fox icon that shows up at the bottom right of your screen to get this option). Then compress the ripped files with DVDShrink if necessary.