Changing the email that authorizes the computer

I downloaded Digital Editions with on Adobe Id (let's say anthony@hotmail.com)

So no, when I go to Library - Authorize computer it says "This computer is authorized for anthony@hotmail.com" and just the Finalize button.

The thing is that I bought a book in an online store with a different email address (let's say paul@hotmail.com).

And this seems to be giving problems when I try to tranfer this book from the computer to the ebook (reader).

Is there anyway I change the email that currently authorizes the computer (anthony@hotmail.com) by the other mail (paul@hotmail.com)?

Thanks