I have a Ameritech DSL w/router. Now I am running DHCP but I want to set up workstations on 192.168.25.?? scheme. I also have 5 static IP addresses. How do set up so the computers will be able to reach internet while maintaining the ip scheme. Do I need to have dual nic's in one particular PC? I am lost

Most corporate router/firewall can do one to one NATing. Each public IP is matched with private IP. What router brand/model do you have?

Now I am assuming you don't have or want to use real IP's, that you want to disable DHCP on your Router, and you want to assign IP/SM/GW/DNS manually using the 192.168.25.x address scheme, yes? If that's the case, you need to disable DHCP on the router (see the manual for steps) - you don't NEED to do this, it's just more secure now. You also need to assign the Internal (LAN) interface of the router with an address in the 192.168.25.x network and use that address as the Gateway and DNS address for the PC's. NATing will be done on the router for your 192.168.25.x network automatically (you can't disable that...but you don't want to). So now you just need to manually assign your IP address scheme to each computer, which depends on OS as to the steps. Good luck. If these assumptions are incorrect, please reply with more specific requirements.