Virus
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have Antivirus? Read on following information tell you everything about
Virus and also you will get to know that why your PC needs Antivirus. What
is a Virus? A
virus is a self-executive and self-replicating program. It alter the way
a computer operates without the knowledge or without the permission of the computer
user. When virus activated it may damage files, cause erratic system behavior,
or display annoying messages. A
(computer) virus is a program (a block of executable code) which attaches itself
to, overwrites or otherwise replaces another program in order to reproduce itself
without the knowledge of the PC user. Most
viruses are comparatively harmless and they may be present for years with no noticeable
effect, but however some viruses may cause random damage to data files (sometimes
insidiously, over a long period) or attempt to destroy files and disks. Others
cause unintended damage. Even benign viruses (apparently non-destructive viruses)
cause significant damage by occupying disk space and/or main memory, by using
up CPU processing time, and by the time and expense wasted in detecting and removing
them. How
Does a Computer Get a Virus? Human
virus is passed from person to person, and same way computer virus is passed from
the one PC to another. A virus can be attached any file that you copy to your
PC. When you downloads file from the Internet or copy programs, its very susceptible
to viruses. Mainly
viruses spread trough e-mail. Generally reading e-mail you cannot get a virus,
but certain types of today's viruses like Klez are different. They are very dangerous
because you don't have to open an e-mail attachment to release the virus. Just
opening the e-mail itself can be release the dangerous bug. Under
normal circumstances, a virus becomes active when you execute a program that contains
the virus. For instance, if you download a program from the Internet and it is
infected with a virus, the virus will attack your computer when you activate
the program. Viruses are everywhere. Although it is rare, viruses have even been
found in commercial shrink-wrapped software.
What types of viruses are there? - Program
viruses infect computer programs and become active when the infected program is
run.
- Boot
sector viruses infect diskettes and hard disks and become active when an infected
disk is used to start the computer. (On a Macintosh, merely inserting an infected
disk can activate a virus.)
-
Macro viruses infect documents (files) through the macro programming capabilities
of some newer programs. Macro viruses become active when an infected document
is opened, and the program opening the document has its macro capabilities turned
on (enabled). As of late 1997, only documents created with Microsoft Word version
6 or later (Windows and Macintosh versions), Excel (5.0 for Windows 3.x and Windows
NT, and 7.0 for Win95), and Lotus Ami Pro have seen infections. But now mostly
files can be infected with virus.
How
to protect PC from Viruses? -
Install latest Antivirus and update it regularly.
- Before
downloading any attachment scan it through antivirus.
-
Be sure to run each attachment you plan to open through the antivirus check. o
Update your Antivirus software frequently.
-
Never download files from unknown persons mail.
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