Hello if your using ZoneAlarm Microsoft Update KB951748 is known to cause loss of internet access for ZoneAlarm users on Windows XP/2000. Windows Vista users are not affected. You might have to update your ZoneAlarm cause mine was causing problems after new update from microsoft causing problems.
Just to let you all know whats going on only just worked it out now from last night.
Following link to ZoneAlarm problem
http://download.zonealarm.com/bin/fr...cessIssue.html