HELP! with Splinter Cell Chaos Theory (uk version)

[Soldja]

right a friend of mine came to my house and we were kinda bored so we went out and got a game, we bought splinter cell chaos theory and brought it back to my house (he is keeping the copy) we made our own mdf and mds file with alchohol 120% and it worked fine everything was coppied and all good, now i can install and open it no problem but when it gets to the screen were it check your cd it came up before that the dvd is wrong, so i searched here did some of the guides and none helped but it did get rid of the no disc sign and the only problem i have now is "The Disc Key you entered does not correspond to the disc in the drive. Make sure you use the correct Disk key"
it then has retry button which asks for a new key to be put in but i dont get it its a fresh key, impossible it was a fresh made mdf and mds file from the copy we bought.
so is there anyone out there willing to help me out
thanx, i really wanna play this game out

- Soldja