Bought a new pc with vista installed and binned it for windows xp.
Clean install of XP, SP2 and Zone alarm 7.0.483.0 and all was fine. As soon as I updated to Windows Service pack 3 (Which does NOT nclude the KB951748 hotfix (complete list of fixes here
)) I had a complete loss of internet connectivity.
After an uninstall of zonealarm and re-installing
all is ok.

Operating System:Windows XP Pro
Software Version:7.0
Product Name:ZoneAlarm (Free)