Which modem make and model do you have?
Have you installed the latest firmware on the router?
The router should be running DHCP so your LAN connection on the PC should be set to DHCP (get IP automatically). The default gateway you receive from DHCP will be the IP of the router. You can put that IP in your browser and login to the web interface.
The router is a TP-Link 3420 and I've not done the latest firmware upgrade.Does the dial up and virtual default settings on the PC remain on CellC or do I set up another internet connection for the router and make that the new default?
Thanks Morkans-again?