[MovedGoalPosts]

You are posting this from another PC, how? Is this also on your ntl broadband? If so, unless you have a router, or are using internet connection sharing, you cannot connect the lappy simultaneously as another PC to cabel broadband.

You will need to power off the modem, completely unplug any network connections from the main PC to the modem, plug in the lappy network connection, now power on the modem, let the modem settle down, and only then power on and boot up the lappy.

To get the PC back on line, you have to go through the entire system again. To avoid that hassle set up internet connection sharing or get a router for a home network.