CD Detection

Whenever i try to play online with Splinter Cell: Pandora Tomorrow, it tells me to insert Cd3. I bought the game and CD3 is definitely in the drive, but it says its not the right CD... anyone else having this problem? Please help, i bought this game for online play..

PS Sorry for posting here, i know this isnt a very technical problem but id get flamed if i posted in general..

did you google?

http://boards.ign.com/Splinter_Cell/b6328/55399884/?8