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Don’t 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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