I don't have a BT ADSL Router/Modem, but have used many different vendors in the past. If you are now using Ethernet from a NIC in the PC to the Router, you won't need any router software on the PC.
The Router software you uninstalled would have been device drivers for the USB connected modem, and since you are now using your NIC there's no need for these. Just make sure you have a operational NIC and you should be good to go.