Hi Elric,
Thank you for your reply.  I am able to ping ip addresses but neither Firefox or Explorere will show web pages.  For instance in Explorer I get:
Internet Explorer cannot display the webpage 
Most likely causes:
You are not connected to the Internet. 
The website is encountering problems. 
There might be a typing error in the address. (
www.bbc.co.uk - i think not)
I then click on Diagnose problem and it says "windows did not detect any problems..." - see diagnostic log below:
Last diagnostic run time: 04/27/09 16:16:02 HTTP, HTTPS, FTP Diagnostic 
HTTP, HTTPS, FTP connectivity 
info HTTP: Successfully connected to 
www.microsoft.com.
Click to expand...