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There are three types of computer infestations. One being a virus, another is a worm, and last is a Trojan horse. Each of these infestations can cause great damage to a computer and/or a network, and they also attack in different ways. Anti-virus software is available to detect and remove these infestations from a computer or network, but sometimes the infestations are programmed to be undetected. Make sure to keep your software updated often or some or all of the following details could happen to you. A virus is a program that replicates itself so as to infect more computers, either through network connections or through floppy disks passed among users. A virus may corrupt files or systems; it may simply annoy users by flashing messages or pictures on the screen, or cause the keyboard to beep. In fact, some viruses cause no harm and can remain unnoticed on a system forever. Viruses are divided into three categories: boot sector viruses, macro-viruses, and file-infected viruses. Boot secto