when i put the disc in it pops up with the installer menu, [Play Multiplayer] [Play Singleplayer] , and the below that it says [Uninstall]?? ive had the game on this computer before but ive completely uninstalled it, and i searched everything on this comp with cod, call of duty, modern warfare, and deleted it all, and when i clock on anything in the menu, it closes the menu as if to open a new window but instead the disc stops spinning and nothing happens.. im running on windows 7