If you were having problems for ZA to load properly on Windows XP try this one, it worked for me! 1 - Unistall ZA following the indications from ZA support: http://www.zonelabs.com/services/support_install_XP.htm 2 - Reboot on Safe Mode 3 - Install ZA from Safe Mode 4 - At the end of the installation when it asks you if you want to start ZA click "No" 5 - Reboot and voila! it works!
Also, you may want to check in at Windows update. There's a new Critical Update, a Program Compatibility update (this is the second one that Microsoft has released for WinXP) available that specifically lists ZoneAlarm as one of the programs addressed. There's a whole long list of other programs as well.