Have you ever observed some suspicious messages in your e-mail box?

It may be some computer viruses-a program written by a malicious author, with the intent of causing damage. It’s a small software programs that are designed to spread from one computer to another and to interfere with computer operation.

A virus might damage or delete data on your computer, use your e-mail program to spread itself to other computers, or even delete everything on your hard disk.

They are most easily spread by attachments in e-mail messages or instant messaging messages. That’s why it is essential that you never open e-mail attachments unless you know who it's from and you are expecting it.

Viruses can be disguised as attachments of funny images, audio and video, or greeting cards files.

A virus also spread through downloads on the Internet. They can be hidden in illegal software or other files or programs you might download.

There are many sorts of computer viruses. Trojan horses are malicious programs that masquerade as legitimate software. One of the most insidious types of Trojan horse is a program that claims to rid your computer of viruses but instead introduces viruses onto your computer.

Worm is a self-contained program that spreads and multiplies over a network connection. A worm may have many functions and abilities. Like a Trojan horse, it may allow others access to your computer. Like a virus, it has the potential to destroy data on your computer.

Spyware generally slows your computer down over time. It’s commonly downloaded alongside freeware or shareware and gathers information without your knowledge, about your web habits and behavior, often for advertising purposes.

If you think that you may already have a virus, seek a professional assistance or download some “search and destroy” software to hunt for potential threats within your system.

Now you know some information about computer viruses and how to destroy them. So beware of viruses or your computer will die.

References:
http://www.microsoft.com/protect/computer/viruses/default.mspx
http://www.kiva.net/index.php?option=com_content&task=view&id=55&Itemid=99