Assuming you have a Superhub of some sort?
http://help.virginmedia.com/system/s...TICLE_ID=27625 Go here, choose your Superhub, and follow the guide provided.
You may also want to set your PC as a specific IP.
http://www.howtogeek.com/howto/19249...-or-windows-7/
Use an IP 192.168.0.x (Above 100 to avoid other devices!) as your IP and the Gateway will be 192.168.0.1, the DNS server will either be just 194.168.4.100 194.168.8.100 if you want to use VM ones or the ones in the guide if you want to use a different DNS service.