It may be a security software. This troubleshooting page may help.
Vista Internet Access IssuesVista can’t access the Internet because of
TCP/IP settings Vista can't access the Internet because of security software
Vista drop the Internet connection ...
www.chicagotech.net/vista/vistaieissues.htm
--
Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on
http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on
http://www.HowToNetworking.com
"AHB" <> wrote in message
news:37A784A0-9BE7-4E29-8FB7-...
>I just upgraded from Windows XP Pro to Vista Ultimate. When I run Internet
> Explorer, or any other program that tries to connect to a www page, it
> fails.
> When I click on the diagnose option on the resulting error page, I get
> this
> message "www.msn.com is not set up to establish a connection on port
> "World
> Wide Web service (HTTP) with this computer." I tried all of the repairs
> listed on the resulting help page which is very basic. I also became
> familiar
> with how Vista appears to handle networking and internet access. I
> compared
> my ipconfig listing with ones I found in various help blogs or sites and
> it
> appears it is connected ok. I get email ok, although I had to do a few
> minor
> repairs. I can't find any mention of the error on Microsft or the listing
> here. Any suggestions?