rapunzel

Hi, have computer using xp pro connected through router.its telling me I have a connection ,but no ie or firefox pages appear. messenger tells me I have internet connection but not a.net connection. Help. the other 2 puters on the network get internet ok,have set mine up exactly the same..why me?

am trying to do this over the phone for sons computer...found a troubleshooter and tried the ipconfig /all , the adresses are correct he tells me. He tried the pinging tests and will not ping www.yahoo.com , but pinged the ip adress and gateway. got the resulkt he expected from nslookup. still not working.