Virus is a computer infection , which has remained the unconquered cankerworm causing havoc and damage to the computer memory , files and even program stored on the hard disk of a system . Computer virus are the hand work of unscrupulous people who are highly knowledge in the field, but profit in one way or the other in causing havoc on computer world wide. To forestall this monester , computer programming expert have invented various type of resident untlity of anti virus program ,which are installed on the system to safe guard and eliminate viruses. type of viruse time bomb, die hard virus,aid virus,ada virus ,Christmas boot.
There are source through which virus are transferred into the system ,through dust , through external drives ,through networking, through internet,Computer antivirus is a program used to detect the presence of virus in computer .
