i installed battlefield:vietnam on my laptop some time ago, played it for a like a day and then uninstalled it. i went back to install it again on my laptop today and wen i put disc one in it wouldnt even give me the option to install, the button was greyed out. it gave me the option to unistall so i clicked it but nothing happened. why wont it let me install the game? i know i meet the requirements becuz i have played it on my laptop before. do i need to delete some reg keys or anything? by the way i have the retail game, i bought it!