|It may be a problem with the drive, not the player software.|
If you have a data DVD, try using that - if it works drive is OK.
If you don't have one, put the movie disk in and hold down the Shift key for maybe 20 seconds, so that the disc doesn't autorun.
Then go to My Computer, right click on the drive, and select Explore. If you can see all the files on the disk, you are probably reading it OK.
If you can see the files, it has got to be a software/codec problem.