A firewall is a built- in utility or dedicated appliance of a computer system or network that is especially designed to forcibly prevent your PC from unauthorized access while permitting authorized communications. It is a device or set of devices configured to permit, deny, encrypt, decrypt, or proxy all (in and out) computer traffic between different security domains based upon a set of rules and other criteria. It typically acts as a barrier which features analyzing all information passing between the networks and the external systems must travel.

I think it is a device or set of devices configured to permit, deny, encrypt, decrypt, or proxy all (in and out) computer traffic between different security domains based upon a set of rules and other criteria
Perfect Uninstaller

Security Tool is a rogue anti-spyware program from the same family as System Security，Total Security 2009, or Total Security. Security Tool is promoted through pop-ups, Trojans and malware webites. Security Tool uses fake security alerts and system scan results to make computer users believe that your computer is infected.

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Total security can make your PC safe with the right firewall.