I have been unable to download the recommended restore software.
In reading the associated thread in the http://forum.xda-developers.com/
site I found that you can force a rebuild the Nook to the factory spec by holding both lower side buttons when re-powering the Nook.
I have done this and had real problems resigning up for my B&N account, not recalling any of the needed information. I went to the local B&N and the person there was most helpful and helped getting the account reset up.
I have downloaded and installed the 1.1.2 update now as I doubt that is possible on a rooted Nook.
Now I am going to root the updated Nook.