Occassionally, after updating windows, some changes are made to
Internet Explorer. When this happens, the firewall will start blocking
it until you let the firewall know that is ok to let the 'changed'
Internet Explorer run. Until then, all you will get is the 'The Page
Cannot Be Displayed'. Many firewalls will do this, and how they are
configured varies. Tutorials covering several firewalls can be found at
http://www.leeindy.com/firewalls.shtml