Virus

A computer program that is designed to replicate itself by copying itself into the other programs stored in a computer. A virus attaches itself to, and becomes part of, another executable program. It may be benign or have a negative effect, such as causing a program to operate incorrectly or corrupting a computer's memory “a true virus cannot spread to another computer without human assistance"
The virus payload, or effect, can be annoying, harmful, or even criminal. A virus may be programmed simply to display a humorous message on screen, or to erase all files on the computer, or to steal and distribute confidential data.

Viruses, Worms and Trojan horses are all ways your computer is subjected to attack, leaving your computer running slow, to stop responding or crash and restart every few minutes. A virus will also attack the files you need to start up your computer and leave your staring at a blank screen.

Trojan Horse

A Trojan horse is a malicious program that is disguised as legitimate software. Trojan horse programs cannot replicate themselves, in contrast to some other types of malware, like viruses or worms. A Trojan horse can be deliberately attached to otherwise useful software by a programmer, or it can be spread by tricking users into believing that it is a useful program.

Worm

A self-replicating computer program, that is self-contained and does not need to be part of another program to propagate itself. They are often designed to exploit the file transmission capabilities found on many computers. It is a malicious program that replicates itself until it fills all of the storage space on a drive or network

Anti virus Software

Anti virus software is used to detect your computer against a virus attack. Nothing will stop everything. One of the most common virus scanners is called Norton Anti virus It is a fairly good product, but it is also costly. I’m not one to pay for something that can be found elsewhere for free. There are free virus scanners out there; you just have to look around for them. One of the best and the one I recommend is called Avast. Avast is free and has free updates. This is very important. The virus definition updates need to be updated every 2-3 days. New viruses are appearing at least daily and as they do the anti virus companies update the definitions to fight them. If you don’t update, you are sticking your neck out.

Resident protection (the real-time protection of the operating system), is one of the most important parts of an anti virus program today. avast! features a powerful resident module that is able to detect a virus before it has any chance to infect your computer.

avast! Home Edition contains resident protection of the computer file system and a resident module for e-mails and news.

File system protection ensures that no virus will be started on the computer. It offers a wide range of settings, such as the possible to specify that files will be scanned during copying, or that the scanning will include files with given set of extensions only.

E-mail/News protection consists of two independent modules; first, there is a generic scanner working on the SMTP/POP3/IMAP4/NNTP protocol level. It is capable of protecting any existing e-mail client that uses these protocols. Second, there is a special plugin for MS Outlook only; the mail scanning is completely transparent, requiring no special settings. A new feature of version 4 is heuristic analysis of e-mail scanners. This feature can protect against new, unknown viruses and worms that are not possible to detect by the usual means. The heuristic module performs a thorough investigation of every e-mail message and watches for suspicious signs, that might announce virus presence. When the number of those signs exceeds a user-defined level, the message is considered dangerous and the user is warned.

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Virus

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