So...my girlfriend bought a late 2008 white macbook off ebay. (First mistake) She didn't include me in the purchase. (Second mistake) But she was trying to surprise me by wanting to switch to mac. So I guess I can forgive her because she was trying to be sweet. Anyways, she purchased one but when it got here the guy didn't do a reinstall of Leopard before he sent it so it has his user name, password, information, and a few trojans all on the hard drive. (The trojans are all from files he downloaded with Limewire). Well I tried inserting the OS X disk into the drive and doing it that way but it is asking for his password to do anything and he wont tell us it so we're stuck. Last night I partitioned the drive using 'disk utility' and did a clean install of OS X on the new half for my GF so she could at least start using it for her stuff. My question is, how can I erase the old half (with his stuff on it) and combine it with my GF's new half to make the hard drive whole again? BTW, I'm pretty tech savvy so I can understand what to do if someone would care to explain.