I was having the same problem and found your post. I'm in OS X on a dual boot laptop and just realized that the clock was off. I set it to the correct time/date and everything worked instantly.
Same exact problem, only I have located my ADE files on my nook and deleted them. I get this:
Document is licensed for a different user account
What user account might that be? This is a brand new out-of-the-box ereader and a brand new Adobe account. This error message is crap. I'm uninstalling and moving on with my life. I was much happier before ADE.
have similar problem ... somehow one book got loaded OK but others did not why can't ADOBE just write a SIMPLE one paragraph explanation on what to do ... NOOK Color is losing its appeal quick I'm also going to B and N website to lodge complaint