I am using a peer to peer domain.
I have changed the "main" computer a couple of times. Every time I change it AC will, of course, ask me to find the database (or I will chose change the database in tools. This information does NOT carry over to the other windows logins. That is what I am referring to.
I have not done a complete fresh install since I put in V4 about a year ago, but I understand the issue.