I was attempting to download a book and chose to authorize the computer as I am not concerned with mobility. I had three book in Adobe Digital but had not been in more than a year. The authorization was still running after three hours and other programs began to seem like they had frozen so I stopped the authorization and closed a few files. When I rechecked Adobe Digital, one of the books that I owned was missing and the software is totally unresponsive. How do I unlock the software and recover the book that appears to have been lost?