I am trying to update my PowerBook from OS X 10.5.1 to 10.5.8. It keeps freezing at the same point during the update! Do I have a corrupt download? Also, the computer is not overheating. I installed OS X on it yesterday and it had no problems. And that took around an hour or so to install. So is there any way to re-download the update? Because every time it uses the same one that has already been downloaded. Will I have to re-install Leopard?