Zone alarm has been dominating in the field of firewalls and nowadays it has started making it's mark even as antivirus. What makes zone alarm so dominating is that it's tight security against any kinda spywares and viruses. It does not allow any sort of malicious scripts also to run in your pc. But the main drawback of it is that when loaded in your computer it takes up huge chunk of the memory ( RAM) making computer very slow, and even making the computer miserable of those who have very less and limited memory.
Today i have come across such a light weight software whose work is as good as Zone Alarm. It is the Firewall from PC TOOL called " Threat Fire".
ThreatFire is dramatically different to traditional antivirus software. Normal antivirus products usually need to have first identified and seen a threat before they can provide adequate protection against it.
This creates a large window of time where threats are undetected and can therefore infect your PC even when you have antivirus software installed.
ThreatFire continually protects your PC against attacks by detecting malicious behavior, such as capturing your keystrokes or stealing your data, instead of only looking for known threats like normal antivirus software. By implementing sophisticated real-time behavioral analysis ThreatFire is able to stop never- before-seen “zero-day” threats solely by detecting their malicious activity. ThreatFire’s patent-pending ActiveDefense technology offers protection against all types of internet threats - both known and unknown - spyware, adware, keyloggers, viruses, worms, Trojans, rootkits, buffer overflows, and other malware. ThreatFire uses its unparalleled protection to hunt down and paralyze those threats that are either too new or too clever to be recognized by traditional “signature-based” antivirus software.
Regarding to memory usuage , ThreatFire only uses two process (TFService.exe and TFtray.exe) and both process takes up less than 8MB of system memory.
ThreatFire 4 is completely FREE for personal home use. Business users must purchase ThreatFire Pro license.
Download from :
Download Threat fire 
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