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What is a computer virus?

A computer virus is a program that makes copies of itself and infects diskettes or files. Computer viruses can spread to other computers and files whenever infected diskettes or files are exchanged. Often infected files come as email attachments. Very often, the email senders have no idea that they are passing on a file with a virus in it. Some computer viruses can erase or change the information stored on your computer, while other viruses may do little or no harm to your system. Contrary to some misperceptions, a computer virus does not cause damages to your computer hardware.

What are common sources of virus?

Email attachments
Software downloaded from the internet
Infected files from file sharing service like KaZaa

How to avoid computer virus?

Run an anti-virus software and keep it up-to-date
Update Windows security patches
Do not install unfamiliar programs
Do not open suspicious emails or attachments