I'm now getting to the stage where I believe the STB is the problem. VirginMedia (NTL as was) use MAC addressing with their modems/STB to make sure no third party can connect equipment to their line. I'm wondering if way back when you had to put in your name and password it as somehow changed something fundamental. Remind me, do you still have your old PC and can that connect to the net? Do you still have the original NTL setup CD?
I have to admit I'm getting close to the dreaded 'Call the VM help desk' scenario.
EDIT: I've just gone back on this thread and see that your old PC still works. (Obvious when you think about it, else how come you're writing to me!!). So we're back to the PC itself. You recall that you found the NIC in Device Manager. Can you go back to that, right click and choose Uninstall. Reboot the PC and allow Windows to re-install the adaptor. Then try again to connect.
--------------------
Do you know that we're all in line for succession to the throne? Really?
Well, if forty-eight million, two hundred thousand, seven hundred and one people died I'd be Queen.