I use 2 problems, one to rip the DVD to my hard drive and the other to capture the screens from the vobs .
I put both of the programs here for people to download:
http://members.cox.net/jlandi/DVD_SS_stuff.zip
Very easy to use
smartripper to rip the dvd
DVD2AVI to pull screenshots from
and if you don't have the latest aspi layer. I've included
forceaspi17.zip
dvd2avi has a small bug. just change the color dept from what ever it currently is to the other choice. You will then be able to press B to capt. the bmp image. It will be placed in the same dir. as dvd2avi