I had to archive and restore my OS (using 10.2.8 on a G4), when I did this a folder was automatically made, called "previous system." My itune mp3s are in this folder. When I try to add them back to my library and click on the song, I get asked for my apple id and password. I enter both and I get an error message saying I don't have authorization. It's the same computer I only reinstalled the OS. Any ideas?