Computer virus is a program that is loaded onto your computer without your knowledge and runs against your wishes. They perform some activities like deleting files or disturbing your computer settings. If a file that contains virus is executed or copied onto another computer, then that computer will also be "infected" by the same virus.
Computer virus affect mostly attack.com, .exe, .sys, .bin, .pif etc Virus can affect any files on your computer.Virus will generally infect executable files or data files, such as word or excel documents
-:: To Protect computer against viruses, follow these steps ::- ( 3 simple Steps ) Turn on the firewall. Keep your computer up-to-date. Install Microsoft Security Essentials and keep it up to date.
Load only software from original disks or CDs. Pirated or copied software is always a risk for a virus.Execute only programs of which you are familiar as to their origin. Programs sent by email should always be suspicious.Computer uploads and "system configuration" changes should always be performed by the person who is responsible for the computer.Password protection should be employed.Purchase or download a anti-virus program that runs as you boot or work your computer. Up-date it frequently. There are free anti-virus programs available.
The computer runs slower than usual. The computer crashes, and then it restarts every few minutes. Applications on the computer do not work correctly. Strange sounds or music plays from the speakers unexpectedly. A program disappears from the computer even though you did not intentionally remove the program. You cannot print items correctly. Disks or disk drives are inaccessible.