I used to leave my system on all the time and just set it to "Stop all Network Activity" when I was away.One day I decided to shut it down, when I came home at the end of the day and booted my system all settings had been reset to 0.
The Firewall settings was blank and it ask to set a new internet zone.
All programs were gone under program control
All privacy settings were gone.
Operating System:Windows XP Pro
Product Name:ZoneAlarm Internet Security Suite