Antivirus software is a program which is used to detect, prevent and remove the malware. It includes viruses, worms and trojen horses. Such programs may also prevent and remove adware, spyware and other forms of malware. The first removal of a computer virus in the wild was performed by Bernt Fix in 1987. The first antivirus software program named as AIDSTEST and Antivir were released in 1987 by Dr. Solomon's Anti-Virus Toolkit. Antivirus software generally runs at Kernal level of operating system. Antivirus software provides security, privacy, increase performance, reduce losses, decrease cost and increase effectiveness. It uses variety of strategies to detect or prevent viruses. Antivirus software have various drawbacks such as Antivirus software can degrade computer performance if it is not designed efficiently.
Inexperienced users may find trouble to understand the prompts and decisions that antivirus software presents. One incorrect decision may lead to a security breach . A faulty antivirus signature may lead to remove essential operating system files. Before Internet connectivity, viruses were spread by infected floppy disks and after Internet connectivity, a user's computer could be infected by just opening or previewing a message. There are several methods which antivirus software can use to identify malware such as: Signature based method which is commonly used to identify viruses and other malware. This antivirus software compares the contents of a file to a dictionary of virus signatures; Malicious activity detection is another approach used to identify malware.
In this approach, antivirus software monitors the system for suspicious program behavior; Heuristic-based detection, like malicious activity detection, can be used to identify unknown viruses. This can be accomplished in one of two ways: file analysis and file emulation. File analysis is the process of searching a suspect file for virus-like instructions and File emulation is another heuristic approach. It involves executing a program in a virtual environment and logging what actions the program performs. There are also various virus removal tools are used to remove the specific viruses from infected computers. Antivirus software includes PC Antivirus Software, Antivirus Firewall Software, Security Antivirus Software, Trojan Antivirus Software and Trend Antivirus software.
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