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Viruses
Frequently Asked Questions
A virus is a computer program which attaches itself to an executable file on
your system - that is to any file with the extension .EXE or .COM - without your
knowledge. Every time the host program is run, the virus copies itself to another
location on your floppy or hard disk. Although some viruses are benign, most are
designed to cause damage to your system, usually by deleting files or corrupting
data. Once a virus has been activated, it usually resides in memory, infecting all
subsequent programs that are run.
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Perhaps the easiest way to catch a virus is from a floppy diskette which is
itself infected - every time you place a diskette of unknown provenance in your
system, you are putting yourself at risk. Viruses can also be transmitted from
on-line sources or from CD-ROM. Once you have caught a virus, it is likely that
you will pass it on to a friend or colleague.
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If you use your PC only for personal use and don’t share information with other
users then the risk is relatively small. If, however, you share information with
colleagues or spend a lot of time on-line then the risk is greater.
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Unfortunately, yes. You can catch a virus from an attachment to an email
message, for example an executable program (.EXE file), a Microsoft Word or
Excel macro. It is also possible to catch a virus from a Web page incorporating
JAVAscript, VBScript or Microsoft ActiveX technology.
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Purchase a virus checker such as Dr Solomon's
anti-virus or McAfee VirusScan. Unfortunately,
installing a virus checker is not enough. New viruses are introduced all the
time. You must keep it up-to-date!
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