I recently bought a used iMac which had quite a bit of software on it, mostly the kinds of stuff that you find bundled with it, such as iWork... iPhoto.. etc.. however when I try to update things like iPhoto (which must be updated since I upgraded to Mavericks and now it doesn't work anymore) it looks for the original owner's apple ID and password, and won't let me substitute for my own. What gives? Is there a solution to this problem?