i bought the game today got home and installed it on my pc, when installed i clik on the crysis 2 icon and the activation came up so i put in my CD serial number in with the dashs then click activate! comes up saying this product key is invaild!!!!!! brand new game not been opend? iv tryed to contact ea but theres nothin on their site i can see about the activtion issus, can any body help me on this plz, thanks