ADE 4.5 Problem Moving Epubs to my Nook

I downloaded the new Adobe Digital Reader program (4.5) recently, and I can't figure out how to transfer epub library books to my Nook. 

I get messages like:  Nook is busy, file has been returned, and other messages.  I tried opening the books in Explorer, copy and pasting it to the Nook My Digital Book file, but when I attempt to open it, it flips me the the MSN homepage.

Also, the ADE isn't recognizing my Nook, even though I have the authorizations.

Has anyone figured out this program yet, and is it possible to revert to the earlier version of ADE?

thanks

Linda