FREE ESSAY ON COMPUTER VIRUSES

COMPUTER VIRUSES

A computer virus is a program that attaches itself to, overwrites and/or otherwise
replaces another program in order to reproduce itself without the knowledge of the
computer user. Generally, the first thing a virus does is attach itself to other
executable files in such a way that the virus code is in effect when the infected files
are run. Viruses may be written to multiply, to damage other programs, or to alter
certain data.
A computer virus is nothing more than a computer program that is coded to remain hidden
in your computer. The virus takes advantage of the operating system to copy itself onto
other files or disks. When a new disk is inserted into an infected computer, the virus
then copies itself onto files on that disk. When an infected disk is inserted into
another computer, the virus then copies itself onto files on that computer's hard drive.
The cycle continues as long as files are shared between computers.
Booting your computer with an infected floppy disk is one of the most common was of
catching a virus. Downloading a file from the Internet or an online service is another
common way of catching a computer virus. Most reputable Internet sites and online
services now scan all their files for viruses but that still does not guarantee that all
their files will be virus free. You can also catch computer viruses from E-mail
attachments. While you can not catch a virus from simply reading an E-mail message,
viruses can be spread through programs or office application files that may be sent as
attachments to E-mails. Always save and scan any E-mail attachment for viruses before
opening the attachment.
The most important thing you should do to protect your system and your data is to install
a reputable anti-virus program on your computer. There are many companies that currently
provide this type of software and many of them offer free downloadable trial versions
from their web sites. All anti-virus software have different options or settings that you
can select to optimize its scanning properties. Many anti-virus programs now also offer
the ability to automatically scan any file you download from the Internet or any file
that you may receive as an attachment to an E-mail.
In order for your anti-virus software to remain effective, you must update it regularly
for the simple fact that there are new viruses being introduced at an alarming rate. All
anti-virus software companies offer regular updates to combat these new viruses. Some
offer these updates free from the internet once you purchase their software, and some
charge a fee for their updates. This is something to consider as you shop around for your
anti-virus software. No anti-virus software is 100% effective. Therefore, any anti-virus
protection strategy should also include regular back-ups of your data. This won't prevent
any viruses but it will reduce your computer's down time if you ever catch one.
Here are some indications that you may have a computer virus.
 Programs take longer and longer to load.
 Hard drive runs even when you are not accessing it.
 Files appear on your computer with strange names that you don't recognize.
 Strange graphics appear on your computer monitor.
 Your conventional memory is less than it used to be.
 Programs act strange or erratically.
This is not to say that your computer has a virus if it displays one of these symptoms.
There may be some other problem causing the behaviour. The above examples are just some
common indicators of a virus.
Computer viruses are not always responsible for the damage of computers. Damage to
hardware, such as Keyboards and monitors are not caused by viruses. Though you may
experience strange behaviors such as screen distortion or characters not appearing when
typed, a virus has, in fact, merely affected the 
programs that control the display or keyboard. Not even your disks themselves are
physically damaged, just what's stored on them. Viruses can only infect files and corrupt
data.
Although schools are not seriously targeted for viruses, every precaution should be
considered to ensure that the risk of getting a virus is minimal. I have proposed a virus
policy which ensures that the risk of getting a computer virus will be minimal.
 Getting authorisation from teachers to load files from home for educational
purposes.
 Scanning disks while being accompanied by a teacher.
 No downloading and uploading programs onto the computers from the Internet or
disks.
 Use computers and the Internet solely for educational purposes.
While very few people have actually seen a computer virus, they are real and they are
here to stay. As the software companies develop new and improved methods to combat
viruses, new viruses appear to defeat them. In conclusion, one fact remains. If you are
on of the millions of computer users surfing the Internet or uploading files from disks,
you need to be aware of the threat of computer viruses and protect yourself accordingly.
Bibliography
** B I B L I O G R A P H Y **
 Symantec Corporation, (2000), Norton AntiVirus (v 5.01.01)
 CNET Corporation,(2000), (WWW), "All you need to know about computer viruses",
www.cnet.com, (accessed 14 September 2000)
 Camilleri, W.L., (2000), (WWW), "Computer Viruses", CHASS,
http://www.chass.utoronto.ca/chass/virues.html, (accessed 11 September 2000)