Your problem and mine are the same.
If you try to authorize your reader you will likely get a message
that tells you you have exceeded the limit for
the number of authorized readers. Good luck with that. I'm going to ditch my reader and get a Kobo or similar wireless unit that does not need Adobe Digital Editions because thay are pretty much useless!
Try to "authorize" your reader. If you get a message that tells you you have too many readers authorized, you'll have to fight with Adobe to get them to reset your limit. Good luck! I've spent days trying to get that to happen and I'm about to chuck all of my readers and go wireless. ( and no more ADE)