Behavior-based PC Tools ThreatFire provides guards against new and unknown threats which signature-based scanners might otherwise miss. ThreatFire runs in the background, monitoring each programs actions, quarantining programs it knows to be bad and alerting on those it considers suspicious. ThreatFire can easily run alongside installed antivirus or other security software, making it an ideal adjunct to existing protection. Even better, the program is completely free for home use.

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