I reformatted my mac the other day... However, my applications were never backed up. They appear in the Applications tab of iTunes, but they're represented by a generic black icon, with their name underneath. Double clicking them brings up a box asking if I would like to locate the files... Is there a way to get iTunes to automatically retrieve them back onto my computer? Or do I need to delete them all from iTunes, and re-download them individually? How will I retrieve paid-for apps???