Creative DVD player stops working. Help! please.

After loading OpenGL with Heavy Metal, the Creative DVD-Player will not play Dvd’s. I have tried everything and determined that it was not the game. After I load OpenGL, I get this error when trying to play a Dvd: Ctplay has performed an illegal operation and will be shut down. Further it says CTplay caused an invalid page fault in module <unknown>… I have found that I can use other DVD players as long as I watch it on the computer, however, I use a decoder card that feeds into the large screen TV, thus other DVD players will not push through to the TV. If anybody knows how I could resolve this instead of using Creative’s player, I would be more than pleased to go that route. Any help with this issue would be GREATlY appreciated. Thanx