to reload the domain controller's OS? Windows Server 2003? I need to install the 64 bit version of Windows Server 2003 on a domain controller. It's the only server in the network and I don't want to lose all the user accounts and other settings because I don't want to end up reconfiguring all of the other computers on the network. Can this be accomplished without setting up another domain controller first? My thought was that I would setup another machine as a domain controller, make it a global catalog server, make it the operations master, and then demote the old server. Then I would do the reverse to bring it back online after the OS was reloaded. Any suggestions would be appreciated. Thanks!