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Operating system is designed to help the user in many ways. In addition, users want to have a secured system, which works efficiently. However, while browsing on the net, certain programs are installed without user's consent. In addition, these programs are harmful for the system and they can damage your system. In result, system's efficiency and credibility decreases if they are not removed. Such malicious programs are called Malware. At times, your favorite browser Mozilla Firefox also crashes and behaves weird when malware installed on the system. To protect the system from threatening programs, one should optimize pc.