Viruses are little bits of software that normally have a negative impact on our computers when they are activated. Usually viruses are attached onto other software programs (games, disk utilities, office documents/Macros, screen-savers), and are activated when these normally harmless programs are started.
A virus is inactive until the infected program is run or an infected boot record on a floppy/CD is read. When the virus is activated it loads into your computer’s memory where it can perform its nasty job or spread itself to other programs on your system or computers in your network.
Floppy disks used in an infected system (or CD-Roms/DVDs burned on an infected system) can then carry the virus to another machine. Programs downloaded from USENET, or file-sharing programs (Kazaa, Morpheus, Limewire etc.) can also spread a virus. More frequently now, email is also becoming a favourite way to spread viruses, Trojan horses and especially internet worms.
It should be made clear, that USENET and file-sharing programs do not create viruses or infected files in any way. It is certain anti-social people who create viruses, and then use these services to spread...
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