I've been using Zonealarm for a long time on Windows 98SE. I have home network with internet connection sharing (ICS). When I upgraded to Windows XP, Zonealarm blocks acess to the internet on all the networked computers. I've uninstalled zonealarm and am using the Windows Firewall now. I had no problem with the computer connected directly to the internet, only the computers connected through the ICS. Is Zonealarm incompatible with Windows XP with a network? Thanks. Paul