Thanks to help from some of you I downloaded DVDFab free, DVDShrink free, and ImgBurn free. I used DVDFab to rip 3 crypted disks of the movie Tinker Tailor Soldier Spy. I then used DVDShrink to shrink the files and make a backup disk. I don't know what program it used to burn the backup disk; I have Windows Media Player, Nero, and now ImgBurn. DVDShrink did not indicate if it was using one of them for a burn program.
Eveything worked fine. I then repeated the process on the 3 disks of the movie Smiley's People with no problems. Everything went fine.
Today I tried to repeat the same process on another movie, DVDFab works fine, but every time DVDShrink gets about one-third to one-half way on compressing it crashes my computer. It has crashed 3 times. Doesn't seem to have hurt anything, just will not complete compressing and writing to the new backup disk. Please Help!