Sorry about the duplicate thread Chris, but I was overwhelmed by the flood of answers to my first post.
 
 
 
 
Still getting nowhere fast.
Reset router to factory defaults and went through the setup procedure again. Connected all the cables in the correct order and booted STB when instructed. All router lights OK.
Booted up the PC, 
at this point it booted perfectly, as fast as normal. opened IE and was once again presented with the Ntl registration page. This time I entered a name for the router and it was registered and accepted. As instructed by the registration page, I rebooted PC & STB. I then entered the url, 192.168.0.1 as per the router setup instructions and the Setup Wizard opened and all seemed to go OK. It did show my correct MAC address, but I clicked on 'Clone' as instructed. I did not set up any encryption at this point, thinking I could return to that at a later stage.
I then clicked 'Finish' and the screen counted down for a few minutes until it completed the setup. I then closed the Setup window and tried to open IE but got a DNS error message almost at once.
I opened the LAN setttings via the Systay icon and it reported that the connection was OK. The details are as follows.
IP 192.168.0.100
Default Gateway 192.168.0.1
DHCP 192.168.0.1
DNS 192.168.0.1
I switched off the PC and tried to reboot, this took around 15 minutes, with a couple of warnings that ZA Pro was initialising. I also found that I had to switch off the PC at the mains to shut it down.
If I remove the ethernet cable between the router and the PC, the PC will boot correctly, except for a 'cable unplugged' warning. If I replace this cable and remove the cable from the STB to the router the PC bootup stalls. I have tried with ZA Pro shut down without success.
 
If I remove the router and connect direct to the STB/ network card it works perfectly. The new laptop I am typing this from using my Zen dial up reports that it is receiving a strong signal from the router, but it also will not connect.
 
Any suggestions gratefully recieved.