Hi,

If running a cable modem, dsl modem or router, have you, at some point, shut
everything down for a few minutes? This sometimes helps.

Or, deleting the History folder and TIF folder may help:
http://mvps.org/winhelp2002/delcache.htm

Try disabling third-party security programs to see if one of them is causing
this. Before disabling a third-party firewall, turn on the Windows Firewall
(Control Panel> Windows Firewall.)

[WinXP]
Try opening a Cmd window (or from Start> Run) enter
ipconfig /flushdns
then clear the Temporary Internet Files and restart.

Or make sure that Windows is showing hidden files and is not hiding file
extensions for known file types then check for a HOSTS file at
[WinXP]
[C:\Windows\System32\Drivers\etc] Open the HOSTS file with notepad. If there
are any redirect entries in it you can put the pound sign (#) in front an
entry to disable that redirect. Or you can rename the HOSTS file to
HOSTS.OLD
More on the HOSTS file at http://www.accs-net.com/hosts/
and
http://mvps.org/winhelp2002/hosts.htm

See if there's anything else to try at:
Can't display- DNS Errors: http://inetexplorer.mvps.org/answers/16.html

Hope this helps,
Don
[MS MVP- IE]