That error is misleading in that the problem is not with the video driver itself. The only thing that would set off the DRM error that is in anyway related to your video driver is the screen resolution settings. You could try lowering the resolution and color settings down to see if that is indeed the issue (easiest thing to do first) but it's not likely the problem either. The most likely cause is the "decoder" portion of that error, directly related to WMP. It's also possible you have a broken DRM license but that would also be unlikely as you are having the same issue on two machines.Go here,
download and save Lalim DVD Player to your HD. Put your dvd in your drive, close WMP if it opens. This player has no installer, just double click to launch it. Your dvd should play using it. (press forward play arrow if it doesn't autostart). Let us know.
FWIW, you can download all nvidia drivers, past and present, from here
. Select Graphics Drivers>GeForce and TNT2>Your OS then click the go button. Older drivers are available from the driver archive selection on the left.