Rooting will not solve the registration issue if it's due to login/password conflict (as afv011 suggested above); indeed it's frequently recommended to first register a new Nook before rooting it.
I would suggest you first try (or have your friend) sign in with the previously used login and password, then de-register the Nook, and then sign up with your own login and password.
Last edited by livramax; 12-17-2012 at 01:30 PM.
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