I have used Adobe Digital Edition to download books from my library to transfer to my Nook. I started last December and never had a problem. Today I tried to download a book and ADE never opened. I tried to open ADE separately and can't get it to open. I rebooted, no help. I have a HP Windows 7 machine. Any ideas? Do I need to re-download ADE? Should I uninstall my current version first? Thanks for any help you can give me. I am a bit shy to do this, as I have seen foruns talking about user activation issues, and hope to avoid that possibility.