been on my ibook, everything has been tip top, but all the sudden when i open for example- itunes, its a prompt like the first time i open it, having to re-set it up, my library is empty, there are NO songs! but when i go under my music folder, everything is there!? i opened firefox, my bookmarks, settings gone- again like the first time i used it. it like my computer is brand new, but when i search i find my pics, files, music etc. and even when i try to set a new wallaper from my pics, it doesnt show up????? but the pictures are in mu pic folder...... so confused here. any suggestions/help?