are you on a 64 bit or 32 bit operating systemdows? i belive this was made on 64 bit, but after you hit unlock all, go into a online match and get a kill then go back to the main menu and see if that fixes it. add me on skype if you still have trouble : gamerkitty199
edit: i have no idea why the guy holding the trophy showd up but its suppost to say windows