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Antivirus works by indexing your system for known viruses kept on their databases, whether it be installed or on the internet. If certain files on your computer matches records in this database, a virus detection is declared, however, it doesn't mean that you are really infected with a virus. Kinda creepy, though. Some virus that scanner software could detect are actually false diagnosis, on the other hand, most are not detected at all.

Antivirus should have several features, a system guard, which runs in the background of your computer, a surf guard, which is your safeguard on the internet, and a scanner. Basically these three you get from free antiviruses.

More of this are detailed in an article at,

http://www.associatedcontent.com/article/2628921/advanced_computer_virus_safety_tricks.html

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