Not open web pages in IE & firefox

[s00]

Hello,
I have got a problem with my system. The Internet Explorer was working fine, but suddenly yesterday for any url
provided in the browser window, it shows 'Page cannot be displayed'. Am not able to browse any pages.
I tried the following
---> Setting the Windows Security settings to default,
---> Checking the network connections.
---> Tried downloading Mozilla and tried browsing from that, to know whether the problem is with IE, but the same problem exist with Mozilla too.
My OS is Windows 7 and XP
Please guide me on what I need to do

 

[DustSailor]

s00, see if these help at all:

Troubleshooting Internet Explorer Issues - http://www.sevenforums.com/tutorials/89919-troubleshooting-internet-explorer-issues.html by Capt.Jack Sparrow

Internet Troubleshooting Guide - http://www.sevenforums.com/tutorials/18203-internet-troubleshooting-guide.html by Dinesh

If not, I would bet the problem lies with your wireless or wired Lan driver(s).

 

[Not Myself]

One place to look for Firefox:

Firewalls - MozillaZine Knowledge Base