Computer Viruses
A computer virus is a program that attaches itself without the user's knowledge to another program, a part of the computer's storage system, the email system, or another part of the computer's operating system or applications. A computer virus also carries a payload, the term for the action the virus takes when it is activated. Viruses can erase files, format the hard disk, install remote control programs that allow an undisclosed user to take over the computer, transmit data to another computer, and other harmful activities.
The essential difference between a Trojan horse and a computer virus program is that the computer virus program is also able to spread itself from one computer to another; after a single computer in an office ...
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