I messed up my iTunes and tried get back to the way it was by doing a Restore using Time Machine. It seemed like the Restore was going well, but then I got the following message "The operation cannot be completed because you do not have sufficient privileges for iTunes". Since I tried to do the restore and got the message I can no longer open iTunes, so I can't change the privileges. Is there some way to fix this, or am I going to have to remove iTunes and download it again?