Could not browse any sites using Internet Explorer

Hi everyone,
My system issue is all about internet browsing. My computer cannot browse to any site.
I posted below the error ,while I was loading to site example.com.

Internet Explorer
Example.com is not responding
Windows is checking for a solution to the problem…
I also try to connect to another site, same thing it will not load. I checked on my internet connection its UP and running.
I restarted the computer, when it rebooted to Windows XP home, I tried again surfing, same issue, site is not responding,
I checked on my LAN connection to the router, its well connected. I even got an I.P address from the DHCP server.
Please help me isolate this internet problem.
