New splinter cell DA DVD wont play



I just brought splinter cell double agent. it installed fine and loads the “multiplayer or single player” screen. but when you choose one you get this error.

Wrong disc inserted.
Please insert the original “Splinter Cell DA Master” CD/DVD.
Please have a look at for further, more detailed information.

I dont understand… because im using the origional!!!

any suggestions on how to fix this??