Lol, I had the exact same problem.
First I've found some glitches in the .72 drivers, so I reverted back to the .64's, but I solved my DVD problem before doing that.
If you have the Nvidia icon in your takbar, right click it, go to display modes, and select analog only.
Gotta love the new safety features on DVD's.
Yeah, the weirdest thing is I was watchin Pearl Harbor, it let me watch the first half, but when i started up the second half I got that error.
Its a frigging Laptop, not a Labtop!!!!