I have a 27" iMac that needed a new hard drive. I downloaded Mavericks from the users account. The installation went well, but later found out that Preview would not open when I clicked on the icon on the bottom. It opens on the top toolbar but even that doesn't seem to work well. Also when I try to open some documents it says that I don't have permission to open documents. Do I need to re-install Mavericks? I just made a Time Machine backup, if I bring that back over after re-installing Mavericks, does that bring the issues I am having back over also?