Can this help?
It's from a previous post.
Quote
Problem: Cannot find server or DNS Error Internet Explorer
When I hit refresh it works fine. Even with my designated HOME page.
My Specs., Windows 2000 Pro., IE 6.0.2600, DSL, Southwestern bell
Solution:
We have been using a LAN connection for over a year and I just updated
everyone to IE 6. For some reason a lot of users were getting the "The page
cannot be displayed" error every time they opened IE instead of a home page
but were able to proceed with no problem after the first refresh.
I turns out that the "Autodial" setting in the registry was being set to
"true" even though they do not even have dialup adapters installed.
Instead of me giving the paths to the registry settings, open REGEDIT and
search for "EnableAutodial" and each place that has the value as "1" or "01
00 00 00" change it to "0" or "00 00 00 00".
If you are using a dialup then this is not for you.
Source: Wilson Bradley
Unquote.