Re: Had to re-install Windows 7, how can I play battlefield 3 without re-downloading it?

That is easy Save the BF3 folder somewhere you are sure it is safe there

Re-install your OS

install origin put bf3 back and you will see it ready to download 

press on it then its is ready to install in the same sec 

if it downloads some files it wont be big sometimes the game is corrupted and origin  downloads the fix

or origin tries to be stupid in the 2 cases you wont download Bf3 and to be sure if origin does delete that bf3 be sure to use the copy function so you always got a back up if that happens XP me if it worked