I under stand that your ISP does not do static unless for that right money(wink wink)I mean set up the router as a default gateway at witch it is right now.In the router setup you have an option for DHCP to be on or off.By default it is on,this is how your comptuers get an IP from the router then the router translates the IP to go out to the Internet.All of this info should be in your router set up.In the DHCP server set up on 2003 you can enter the default gateway(the router) and IP address you wish not to be given out(servers and router IP)I mean a static IP from the TCP/IP properties of the server,servers should have static IP's cause if the IP changed like it does with DHCP then the mapped network drives,shared folders,shared printers, and so on and so forth wouls have to mapped all over again.You set up the user accounts on the domain controlloer,then you right-click my computer and select properties,then go to computer name,then there is a button for change to join a domain.When you enter the domain name in and select ok then it is going to ask you for a username and password with the right permissions to join the domain,use the administrator account from the domain controller.