Ok so here is the scenario: I just bought a 17 inch MBP (loving it by the way) from someone off of craigslist and he has a user name under the administrator. I want to change it so that I am the only account on this computer...however he wasn't able to give me his install discs because he had a leopard family pack. So basically I need to delete his admin account and make my account the only, and primary account without my leopard discs. Is this possible. I know I'm going to have to buy Leopard eventually...but I'm going to hold out as long as possible.