I have a MacBook Pro that I purchased in 2008. I'm preparing it to be formated and backing up the data I need so I can start fresh. My roommate has a newer MacBook Pro that came with Snow Leopard. Could I use the install disks that came with his computer and get Snow Leopard on my Mac? I know mine is capable of the new OS. It just would beat paying for the upgrade like I've neglected to do for awhile.