I'm a little confused anout the procedure of wiping and installing an os on my ssd. I saw something somewhere that said some sort of program was needed to sort the drive out if it has had an os on it ...

Recently my daughter purchased an early 2011 13" MacBook Pro. The seller reinstalled Snow Leopard with updates, and then upgraded it to Lion. Unfortuantely, some of his user info keeps popping up in ...