Also try Comodo, it's rated as the best free firewall out there. I also want to know, are firewalls necessary compared to Windows Firewall? Just for web-surfing and gaming, sorry for hijacking thread.
I would not trust any Microsoft security software. Given the prevalence of Windows, hackers will go after Windows and other Microsoft programs first. Regardless, you absolutely need to use a firewall. Bad guys are always trolling for unsecured computers
comodo uses less reosurces than ZoneAlarm and both are equally good. But the sweetspot is zonealarm for most