Vista Administrator

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In Vista there is an Administrator account, however it is disabled on install. If you join the domain you can login with any domain user you want, however if your domain connection is lost, your computer account or the domain lost then you can only login with the local user you created at install -- which can't be the Administrator. If you forget the the password to this user there is a problem. So to prevent a reinstall you need to enable the Administrator account with this:

Net user administrator /active:yes

at the command line under elevated permissions (Run As Administrator). The administrator password is blank (which means you don't have to login) by default.

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