As we know computer virus can make our computer so slow,hang and the program will` destruction.
so that can our prevent if we know how virus works,and how the virus criteria and characteristic: i give you simple meaning
A program called the new virus can be said is really true
If the virus will have at least 5 criteria:

1. The ability of a virus to get information
2. Ability to check a program
3. Ability to multiply and transmit
4. His ability to manipulate the
5. Ability to hide themselves.
SOrry friend i can't write more long here but if you want to know more you can follow this link egadged.blogspot.com/2009/10/characteristics-and-criteria-virus.html copy and paste this link :
thanks

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