NOOK Simple Touch says "Error Dialog: user not activated" whenever I try to open e-books?

Question

I have had my Nook Simple Touch for about a year now, and I have been using Adobe Digital Editions without a problem. Now, all of the sudden, Barnes and Noble updated my software and I can't read any of my ADE books!! It just says "Error Dialog: User not activated" every time I click on them. I have looked at many other websites and I have tried plugging my nook in to my computer and reauthorizing it, reauthorizing my computer, deleting the digital editions file and .adobe-digital-editions file, redownloading my books, turning my nook off and on, crying, and screaming. The weird thing is, in all the instructions, it says a pop-up box will come up when I delete the files, but it never does. Is that normal? I always have to do it manually by clicking on the gear. I even made sure I "unhid" all the hidden files. I HAVE DONE EACH OF THESE AT LEAST 5 TIMES AND THEY NEVER WORK!!! HELP ME, PLEASE.
Also, a lot of the websites say to make sure your Barnes and Noble ADE I.D. is the same as the one on your ADE computer I.D.. Is the B&N ADE I.D. different from just the Barnes and Noble ID? Becasue I have been using my sisters email for my computer ADE and my email for the B&N I.D.. Are they supposed to be the same? If so, how come I was able to use it without a problem before?? I tried reauthorizing ADE with my email, because I also have an ADE account with my email, but then it wouldn't let me redownload my books onto the new account. Does this mean I have to change the ADE computer I.D. and wait until my books are available again to read them? Is that the way to fix it? UGH!
Help is much appreciated.
P.S. I have ADE version 2.0

Answer 1

Just to clarify, there are two levels of Authorization -- one for the ADE software and one for the nook. You have to use your Adobe account to authorize both (and they have to be authorized with the same user name). It sounded like your original problem (Kcoline) was with the Nook authorization, and it was the same problem the rest of us were having.
To get your files back, I suggest carefully reading over the "Activation and Authorization" section of the ADE help. It appears that ADE will automatically find your files but note the "Note" in quoted text below... 
http://www.adobe.com/products/digitaleditions/help/
"After activation, any books, magazines, or other documents you previously bought with Adobe Acrobat® or Reader® software are migrated to Adobe Digital Editions. This is usually a relatively quick process. Adobe Digital Editions opens each item and reverifies its license to the user. If you don't have DRM-protected items, you don't need to be online during the migration. If you have a large number of items (for example, more than 100), then this process may take a while, but you will see a progress bar indicating the state of the migration as it proceeds.
Note: Items that you previously borrowed from a public library with Adobe Acrobat® or Reader® software are not migrated to Adobe Digital Editions. You need to return the library item and then borrow the item again with Digital Editions."
If it's not finding your files, it may be because they're located in a folder different from the one that ADE is trying to use to find them.
You may also want to check the "Transferring items between computers" section, as this describes where the files should be located, and how to reimport them into your library.
Good luck!