Without any known change, a couple of our PCs have started to not load
Internet Explorer pages.

The proxy info has been re-applied and all drivers/Windows Updates are
applied. The page says 'Opening Page' but nothing loads. If the Network
Card is swopped over then we can connect OK again, but this has happened
to a number of our PCs. Our anti-virus software is up to date and we have
anti-spyware software in place.

Please could anyone advise?