You can do as sugested and clone the MAC address of your NIC (if you are using one) into the router so that the STB sees the IP address that is registered against your account. (you can get this information from a dos prompt, start menu, run, cmd, ipconfig /all (don't leave the space out of that command)
Or you can register that router against your account by going to the provisioning page that is in the NTL setup manual you get with your welcome pack and CD.
Also make sure that if you have any firewall running that it is not blocking the new network connection (router) and that your security settings for internet explorer are set at the default levels for now so that the provisioning page can load properly.
There's a lot more info here
http://homepage.ntlworld.com/robin.d...s/macaddr.html