I've had a Mac for 19 months now and my iPhoto doesn't work. When ever I open it, it says: "Your photo library is either in use by another application or has become unreadable - Shut down and restart your computer, and then open iPhoto again. If the problem persists, try rebuilding your photo library. To do this, quit iPhoto, and then reopen it while keeping the Option and Command keys pressed. You can also try restoring your photo library from a backup." I've tried doing all of that but it doesn't work. My laptop is from school and I can't exactly take it to Apple (School rules, have to do it their way). Is there any way to fix it?