My apologies if this question has been answered, but I searched and couldn't find it. I am completely unable to open any PDF with my new MacBook Pro, which is running Leopard (OS X 10.5.1). Preview doesn't work, Safari doesn't work, QuickTime doesn't work. If I must uninstall and clean install, I'd really appreciate any guidance anyone could give about this process. For instance, will I lose everything that's stored in my programs (i.e., all my personal files, preferences, and emails) when I uninstall? And what's the best way to go about backing up my info, uninstalling, and installing? Thanks in advance for any help you can provide.