Thanks for your prompt reply.
The site in question is "http//www.katzeyeoptics
Following the instructions in the microsoft support site I unchecked "use http 1.1" and "show friendly http message"
Still no joy. The "unfriendly" http message now reads: "GET to / not supported. Additionally a 404 Not Found error was encountered when trying ErrorDocment to handle request."
Next I followed your instructions to disable IE add-ons.
Still no joy.
I have contacted the owner of the URL and they claim that they have not had any problems at their end. There site seems to be functioning fine.
Additionally I have tried to ping the site and all packets sent are returned properly.
Thanks for your willingness to help. Any more ideas?