I have done that along with operating system and just about everything else that was the suggestion by activision
Thats all I know to do...I'll look into it on callofduty.com, you can check there to, there should be an answer...if not make a post and someone should know. Will get back with you on this one.
Catch me in vent later tonight and tell me about whats going on and what you've done and I'll help you out all I can.