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Security & Anti Virus 

Strange as it may sound, the computer virus is something of an Information Age marvel. 
On one hand, viruses show us how vulnerable we are — a properly engineered virus can have a devastating effect, disrupting productivity and doing billions of dollars in damages. On the other hand, they show us how sophisticated and interconnected human beings have become. For example, experts estimate that the Mydoom worm infected approximately a quarter-million computers in a single day in January 2004. Back in March 1999, the Melissa virus was so powerful that it forced Microsoft and a number of other very large companies to completely turn off their e-mail systems until the virus could be contained. 
The ILOVEYOU virus in 2000 had a similarly devastating effect. In January 2007, a worm called Storm appeared — by October, experts believed up to 50 million computers were infected. That’s pretty impressive when you consider that many viruses are incredibly simple. When you listen to the news, you hear about many different forms of electronic infection. The most common are: 
A virus is a small piece of software that piggybacks on real programs. For example, a virus might attach itself to a program such as a spreadsheet program. Each time the spreadsheet program runs, the virus runs, too, and it has the chance to reproduce (by attaching to other programs) or wreak havoc. 
E-mail Viruses 
An e-mail virus travels as an attachment to e-mail messages, and usually replicates itself by automatically mailing itself to dozens of people in the victim’s e-mail address book. Some e-mail viruses don’t even require a double-click — they launch when you view the infected message in the preview pane of your e-mail software [source: Johnson]. 
Trojan Horses 
A Trojan horse is simply a computer program. The program claims to do one thing (it may claim to be a game) but instead does damage when you run it (it may erase your hard disk). Trojan horses have no way to replicate automatically. 
A worm is a small piece of software that uses computer networks and security holes to replicate itself. A copy of the worm scans the network for another machine that has a specific security hole. It copies itself to the new machine using the security hole, and then starts replicating from there, as well. 
It is very important that you have some good anti-virus software installed on your computers and servers to keep this threat at bay. The cost of anti virus protection against the damage a virus could do is incredibly small and yet companies still try to get by. This is a false economy and the small initial cost far outweighs the loss your company would suffer should its systems be brought down by a virus. 
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