The World’s most downloaded firewall software-ZoneAlarm Pro Firewall

ZoneAlarm is one of the most  popular firewalls. ZoneAlarm can block or allow any application which tries to communicate with the network or the internet. If an unknown application would like to have access to the internet, you are asked to allow the access. This firewall is suitable for both Windows XP and Windows Vista and disables the Windows firewall automatically

ZoneAlarm Pro Firewall from Check Point Software Technologies Ltd. (Redwood City, California) is a standalone Windows (XP, Vista or 7.0) software firewall that stops traffic threats that are arriving or departing from a personal computer. The firewall cooperates with antivirus software and antispyware from competing vendors. Check Point also offers security suites that bundle the firewall with complementary security modules.

Network and Program Firewall Features
These features deliver proactive firewall protection with multiple layers of security that stop inbound, outbound, and program attacks while remaining completely invisible to hackers. It also prevents spyware and other malicious programs from sending your personal information across the Internet, automatically makes your computer invisible to anyone on the Internet, protects your programs from malware, and more.

Operating System Firewall (OSFirewall) Features
This additional layer of security prevents hard-to-remove spyware from getting onto your PC and causing damage. The OS Firewall will monitor program installation and registry changes and file access down to your PC's core. It will also monitor additional program actions for more thorough protection, and Prevents malicious software from damaging files in your core Windows operating system.

Identity Theft Protection Features
While ZoneAlarm continues to secure your identity information on your PC, these new Identity Theft Protection services also prevent identity theft over the Internet and even in the physical world.

Anti-Spyware, Spy Site Blocking, and Privacy Protection Features
These features always run full-strength to catch and eliminate spyware before it gets onto your PC. It prevents spyware from getting on your PC by blocking its primary source: spyware distribution websites. It also manages and blocks pop-up ads, online profiling, cookies, cache, and scripts so you can surf in peace.

Other Protections
Email security will quarantine suspicious attachments to help defend against unknown viruses, and automatically halts outbound messages to keep you from accidentally infecting others. The Wireless PC protection feature automatically detects wireless networks and secures your PC from hackers and other Internet threats wherever you're connected--at home or on the road. One-click control temporarily suppresses most security alerts and prevents them from interrupting your gaming while maintaining maximum protection for your PC. And last but not least, the SmartDefense service feature provides your PC with real-time security updates, improved response to breaking spyware threats, and new attack protection capabilities.