Art has a 3TB hard drive that he uses as a backup, but now he doesn't have access rights to the hard drive. Leo says that can happen if he moved from one Windows installation to another. What it sounds like is that Windows locked it because it thinks it's owned by a different account. Microsoft has a tech note on how to gain possession of files through an Administrator account. But if he's using a slide out hard drive, it can get locked, and that's a serious problem.