Delete microsoft office word 2003 by mistake

Hello,
My loptop didnt come with microsoft office word 2003 , so i got a friend to install it for me using a disk but now i uninstalled it by mistake now i cant access word or my college work.is it possible for me to download microsoft office word 2003, and it works as if if was it was done by the disk? If yes! can you give me a site to go on plzzzzzzzzz