Whenever I put the CODWAW disc in to play co op I get the message place disc in, but it's already in. I see a scratch on it and when I put the disc in the screen comes up where is gives you options for play and what not. But when I try to play any co op games I get the message about placing disc in. I think the scratch on the disc is right in the spot that's required to start the co op game. Does treyarch have a program for replacing a scratch disc?