While talking about computer “viruses”, there are actually several different classifications, each referring to a specific way in which they behave.  The general definition of a computer virus is a piece of software that “infects” another program (by attaching itself to it) and then replicates itself by infecting other files on the same computer or other computers.  A computer “worm ” on the other hand, does not need a host program, and is simply able to run by itself and infect other computers.  Other classifications exist, such as Trojan Horses, Bombs, Chameleons, Bug-ware, and Replicators.  Some software may fall into multiple categories, and the range of effects they have on your computer is tremendous.  Some may have no impact on your computer operation at all, while others can cause severe performance degradation, cause individual programs or your entire system to “Crash”, or completely destroy your files.  Even worse, are the ones called “Data Diddlers” which do not erase data, but only slightly modify the data.  An example of this are didlers which once they have infected your system, change random characters to other characters.  They may go after your accounting records, and change the number 4 to the number 7 randomly, or they may replace the word “don’t” in a word processing program to the word “do”, so that “I don’t’ want you to send me this item” becomes “I do want you to send me this item”.  Data diddlers can be particularly troublesome as their effects are not usually easily noticed, but their consequences severe.

The best way to ensure your computer is safe is to always run anti virus software and keep your operating system up to date.

For information on the latest threats and ways to protect your computer visit:
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