I have my modem plugged into the computer and everythings running fine. I want to plug the modem into the router, router into computer and get that up and running. I'm running XP. The router connection will be wired, its an older computer.
There's normally nothing you need to change on the PC. As long as you're setup to obtain an IP address in the network configuration, you don't need to change anything. Just configure the router and go.