I recently purchased a secondhand macbook pro with os x 10.5. The only problem is that it's filled with the previous users junk (about 70% of which is porn, lmao). I would like to do sort of a wholesale delete and reduce the HD down to just the OS. This wouldn't be a problem if I had the actual DVD, but unfortunatley the one he gave me is damaged beyond repair. I don't have the money to buy a new copy and I can't bring myself to pirate mp3's let alone an operating system. In short, is there a way to restore the OS to factory condition without the use of the OEM dvd.