I bought a computer off of craigslist about 2 years ago. It works great but I want to re-install the OS but whenever I bought the computer the guy either didn't have the disks or he just didn't want to give them to me. What I want to know is if there's any way for me to re-install my OS without the disks, it's a custom built computer so I don't know if the key code or whatever would be inside the case or not. I'm pretty computer illiterate I would do a system restore but I wasn't aware that it's automatically set to delete save points every week so I'm pretty screwed there too
The OS is windows 7 ultimate if that's of any importance.