Control Panel>Internet Options icon>Connection tab>LAN button. Put a tick in "Automatically detect settings" and remove any ticks in the Proxy boxes in the lower pane. Restart the system and try again.
Thank you. That box is already ticked.
Due to time constraints I have now paid Microsoft to resolve the issue.
They say there were some corrupted registry entries. But that is all I know at the moment.
So I think this question is now closed. Thank you.