Hi Neemobeer,
I did what you suggested but all I got was a window opened on the desktop which looked like the Command Prompt but this quickly closed it's self before I could do anything with it. However while puzzling over this Microsoft started downloading and then installing a whole raft of updates. These included Internet Explorer 8. When I tried to use this it declared that it would no longer be supported by Microsoft but surprise surprise it allowed me to access the internet. The problem is therefore now fixed! I will of course be very sparing in my use of the internet on this machine even though the firewall is on and my AVG Anti-virus is up to date
Thanks for your help anyhow.