Change settings for DVDDecrypter

Norton Labs UAC is the best:

http://www.nortonlabs.com/inthelab/uac.php

Then run DVD Decrypter as an Admin!

(1) Click Start
(2) Click Control Panel
(3) Be sure to choose the regular Vista screen, not the "CLASSIC VIEW"
(4) Click "PROGRAM"
(5) Click on the small subheading "making softwares working in an older window version" (compatibility verification)
(6) Follow the steps to choose DVD Decrpter to work in an older environment: window 98, 2000, XP, etc.
(7) Once you finish, follow the same procedures to turn softwares that do not work in the vista, e.g. DVD Shrink
Good Luck!