supposedly this is something to do with Illegal Copied versions of COD2 stealing your key...
From what i've read-there is a exe file that searches for a key that is not being used and applies it to the game......
Also known problems with the 1.2 patch is also you cant uninstal lthe patch once you have installed it-to uninstall it you have to uninstall the whole game
i think the best bet for you is have a look on the IW forum found
Here and have a nosy around to what suggestiosn they come up with
