Computer virus is basically a set of instruction or program which a computer understands. This program instructs the computer to perform some particular task. Most of the time the task is deletion of data from the computer, erasing entire hard drive, making a data corrupt. Some virus just displays a message or produce sound. When we encounter such type of cases then we say the computer is affected by virus. Name of some virus are Klez, Melissa, W32, Michelangelo. The virus enters the computer system from internet through e-mail messages or instant messaging messages. When we download file from internet or copy audio, video file or any other file virus can be attached to that file. While opening those files or executing those programs virus get active and start destroying our computer system. There also exists some virus so powerful that we do not even require opening the virus attached file. Virus do not affect write protected disk, also the computer hardware like monitor, keyboard, it only infect the software. The program (virus) is written by some unknown person making people suffer. As a professional way these people also create software to tackle their made virus and sold in market making money out of it. Fortunately the antivirus software can handle virus. This program checks files for virus before entering the system. It is the user’s task to keep antivirus updated to make the system completely protected from virus.

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