Computer virus

Computer Virus,its type,How we protected

1. Computer Virus

2. Introduction What is computer virus ? Symtoms How does it spread? What a computer virus do ? Types of computer viruses ? Prevention from computer virus ? Antivirus Software Conclusion Content

3. INTRODUCTION TO VIRUS A virus is a program designed by a computer programmer (malicious hacker) to do a certain unwanted function.

4. What is computer virus ? Computer virus is a type of destructive program that can replace itself by making copies of itself without the knowledge of the user. Computer virus is a term given to man-made computer software or system to destroy computer programs or computer. The virus destroys data, useful application, programs, and even the operating system. Computer virus hides themselves in other host files. They are not visible to us. The viruses can corrupt, delete files and programs. Computer Viruses affect the computer in many ways. It can destroy data, files or programs and cause the system malfunction. The destructive effects of viruses are different according to their types.

5. Symptoms Letter looks like they are falling to the bottom of the screen. The Computer System becomes slow The size of available free memory reduces. The hard disk runs out of space. The computer does not boot.

6. How does it spread? Computer Viruses spread by attaching themselves to other computer program files. When you exchange a file or pendrive with a virus, the virus spreads from one computer to the another. Viruses also spread when a computer engineer comes to repair your system and put his/her diagnostics disks in your PC.

7. What a computer virus do?

8. Types Of Computer Viruses Computer Viruses Boot Sector Virus Time Bomb Logical Bomb Macros Virus Script Virus

9. Time bomb A time bomb is a virus program that performs an activity when a certain action has occurred Logical bomb A logical bomb is a destructive program that performs an activity when a certain action has occurred

10. Boot sector virus The boot sector virus infects the information system during the start-up process. It tends to create the bad sector of the hard drive or floppy disk. The virus infects the system by using infected diskettes during start up. The entire computer system becomes slow by reading the virus from the disk boot sector. The examples of such viruses are C- Brain, Stone, Disk Killer etc.

11. Macros Virus A macro virus is associated with application software like word and excel. When opening the infected document, macro virus is loaded into main memory and destroys the data stored in hard disk. Script Virus The virus which is developed by using script language is known as script virus . This virus uses script language to transfer from one computer to another. This virus is created by using script language like VBscript , Javascript . The examples of such viruses are Readlof.A , Sujim . com.np .

12. Computer viruses are very harmful to computer system. They can destroy data and information. So, computer should be protected from viruses. Protection from virus

13. Install anti-virus software from a well known, reputed company and use it regularly. Do backup your entire system on a regular basis. Because some viruses may erase or corrupt files on your hard disk. Do not use any pirated software. Lock the computer system using password to prevent your computer from being used by others. Do not download any programs from the internet unless you are confirmed that they are virus free. Be careful while checking mail having attached documents. The computer system can be protected from the viruses by the following ways:

14. Antivirus Software

15. Top Seven Antiviral Program Kespersky Antivirus Data fellows E-Plot Mcafee Antivirus Symantec Norton Antivirus Bit Defender 2010 Quick Heal Antivirus ESaSS ThunderBYTE

16. CONCLUSION: Be aware of the new infections out there. Take precaution measures. Always backup your data. Keep up-to-date on new Anti virus software. Simply avoid programs from unknown sources.