If you cannot reach any server there is something that is blocking your Internet connection. Check your network status on XP Pro ---> Start/Settings/Networks Connections/Local Area Connection/Properties. Check again if you have installed any program that could block your connection (firewall, antivirus, popup blocker, whatever...). By the way, are you sure that you didn't change something related with your network connection after installing SP1?
If you have a router you can verify its state through www/telnet (ports, filters...). As last solution contact with your Internet Service Provider.
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