A nephew works for a computer company (not Apple) that is offering Macbook Pro refurbs to their employees. Specs: 15 inch, 2.6GH, 4 or 8 GB ram, 320GB hard drives. No year given. No operating system. Price: $649 or $759. How would you acquire and install an OS? (Probably SL). I have a SL disc, but is it only for my Macbook?