Am I just doomed here?
No. Just delete the associated records from your Viewer address book.
Also, if I could click a button to just deregister everything and reregisters everything that would be great. I cannot even figure out how to deregister a current host with the latest updates :(.
You no longer have to deregister anything because the Host is a "free floating" module starting version 6. Even if you have old 5.6 Hosts that you want to upgrade to version 6, just do that (upgrade that is) and you are done. Your registration information is not kept anywhere except the Host PC itself. So when the old installation is gone, you are good to go with the new one.
Hope that helps.