ZoneAlarm protects automatically from the moment it's installed. ZoneAlarm Free Antivirus is also available.It barricades your PC with immediate and complete port blocking. And, then runs in Stealth Mode to make your PC invisible on the Internet - if you can't be seen, you can't be attacked. ZoneAlarm delivers simplicity without compromising your security. A getting started tutorial explains controls and alerts to get you up and running quickly. And, to keep you confident that you're always protected, intuitive color-coded alerts rate security risks - in real time.