Here are a couple things that may help:
-install a different dvd player on your computer such as VLC/MPC/generic program. i recall having some sort of issue between my video card, TV, Windows xp, and Media Player Classic because my video card wasn’t HDCP compliant
-update the firmware for your dvd drive, drivers for your video card
-download a program that removes the copy protection and copies the dvd to your computer, assuming you have the hard drive space. What you needs is a program to decrypt dvd’s, a “DVD Decrypter” if you will. This is probably legal where you are, so long as you don’t burn copies for other people. Also, Simon will probably hunt you down if you do.
(may have said too much?)