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<p>First you have to install any one anti-virus software and make it ready with online update, and then scan your computer with that anti-virus software. Reliable anti-virus software features a scanner equipped with the technology required to detect and eradicate viruses, worms and other members of the malware family.<br /> <p> <br> <p>Viruses have many strategies to infect your computer, like avoiding detection from protection software. To prevent these virus strategies and protect your computer anti-virus software also has some methods, like Norton anti-virus use Signature base and Heuristics-base detection. Signature based detection includes searching for knowing structure within executable code, however your computer can be infected with most new virus which signature is not known. In that case heuristics method can be used. It can identify new viruses by variation of such code, in files.<br> <p> <br> <p>Norton anti-virus has many other features, which it upgrades from version to version, like Sonar protection. SONAR examines the behaviour of applications to decide whether they are malicious. Various things are checked such as if the program create a desktop shortcut or create add/remove programs entry before determining the program is malicious. Another feature is Norton insight. It is a program that comes with the Norton 360. It improves the speed and quality of computer scan. It identifies well known files of client machine and excludes them from constant monitoring and scanning. It only scans unknown and unsecured files. Skipping the already known files helps the scan more impact. Symantec antivirus can interaction with rogue software, actually these type of software are nothing but a misleading program, it always rebranded and cloned of its previous version.<br> <p> <br> <p>Many other anti-viruses have features like anti-virus, anti-malware, anti-spyware which is used to detect and remove viruses from your computer, whenever you scan your pc with this anti-virus software.

<p>There are many different types companies, who create different anti-virus software. One of the most popular companies is Symantec Corporation. Symantec has its own products like Symantec Anti-virus, Symantec internet security, Symantec also have another anti-virus products called Norton. Symantec launched various versions of its products and till now, the latest version of Symantec Corporation is Norton Internet Security 2011. It's about 25 years before Norton antivirus came on the market. The name of the first Norton anti-virus was Norton Commander, released in the year 1986, served as a standard interface for DOS. This version of Norton was invented to protect DOS from malicious programs. Norton anti-virus can be listed as an oldest anti-virus program. The initial version of Norton commander was called vdos with a slandered interface for dos, for initial virus protection.<br /> <p> <br> <p>Compared to other anti-virus software, Norton provides in-built firewall software, e-mail scanner, anti-rootkit, and anti-spyware, anti-virus. Some newer options released like Sonar protection, file insight, threat insight, insight network etc. It is fast and compatible with vista like operating systems.<br> <p> <br> <p>Other popular companies are McAfee, which provides anti-virus, anti-spyware, firewall software like features and PC utilities, like QuickClean tool, defragmenter and file shredder, which lets you permanently delete sensitive files in a manner that they can't be recovered. Protection software is Kaspersky; it also provides anti-spyware, anti-virus and firewall software. One very unique feature of Kaspersky is the virtual keyboard; this small application lets you input sensitive information like credit card number, password in online without worrying about keyloggers or hackers.<br> <p> <br> <p>Many other anti-virus software have been uses, like ESENT Webrot, NOD32, QuickHeal, AVG, AVAST anti-virus etc. you can also download free versions of anti-virus from online. Whichever anti-virus you're using make sure one thing that you have to update it regularly to protect your computer.

<p>Anti-virus software is a unique software program, which is used to prevent, detect and remove malicious programs, including but not limited to computer viruses, computer worm, Trojan Horses, Spyware and Adware.<br /> <p> <br /> <p>The primary method of preventing the propagation of malicious code involves the use of anti-virus software. Anti-virus software is an application that is installed on a system to protect it, and to scan for viruses as well as worms and Trojan horses. Most viruses have characteristics that are common to families of virus. Anti-virus software looks for these characteristics or fingerprints to identify and neutralize viruses before they impact you.<br /> <p> <br /> <p>There are many types of known viruses, and new ones are added all the time, so in this situation without anti-virus software your computer will be at great risk. There are different types of anti-virus software, some of them use basic technique to detect and remove viruses and malicious codes from your pc.<br /> <p> <br /> <p>On the other hand some anti-virus software uses its own unique features to protect your pc. Many known anti-virus software uses some very useful method, like Signature base detection and Heuristics base detection to detect viruses and malicious programs, and uses other methods and techniques according to their features. As new viruses added almost every day, anti-virus software companies also upgrade their anti-virus protection products, they launches their new version of antivirus software within very short period of time to provide users maximum protection from most recent threats.<br /> <p> <br /> <p>So if you are using any anti-virus software, it is recommended that you upgrade it and its virus definition regularly to be protected from viruses and malicious programs.