I have a Nook GlowLight Plus and use ADE 4.5.7 and the last two library books that I have tried to put onto my Nook have given me the above Error Message. Considering the books have just been downloaded I know that they have not been returned. I've tried a few different ways to put the books on my Nook and get the same error each time. I have contacted Barnes and Noble and haven't heard back yet. I really don't want to de-register and all that jazz every time I have a library book that I want to read. Anyone have any other ideas? Thanks for the help!
Close all applications. Press WINDOWS + R. In the Open text box, type regedit and then press Enter. The Registry Editor opens. In the left pane of the Registry Editor, locate the following registry key: HKEY_CURRENT_USER\Software\Adobe\Adept Remove the Adept Folder. In the Confirm Key Delete dialog, click OK. Close the Registry Editor.