Is it possible to install Norton antivirus Corporate edition on client machines that are not on your network, then plug them into your network after the installation? I want the clients to be managed by the server, but I'm not sure I can do it this way. Do I need the client to connect to the server during the installation?

We are taking our network down for one week to do some serious maintenance, and would like to install NAV corporate at that time.
Does anyone know if this is posible?