|It is not driver for the modem/router that you need as no such things exist.|
If ipconfig shows nothing you will need driver for your Network Interface Card. If you go into Device Manager and look for any yellow question marks you will probably see one for Network Adaptors. You need a driver for this.
If the NIC is built into the motherboard you will get them from the motherboard manufactures web site. If it is a plug in card you will get them from that manufactures web site.