Though some anti-virus programs are quite pricey, there are some very good options for those wanting something relatively cheap or even free. Many free anti-virus programs are available that will protect your system just as well as a subscription-based anti-virus program. Even if you choose to go with a program you have to pay for, the cost of the program and subscription to their service will almost certainly extend the life of your computer, meaning you'll have to purchase new computers less frequently than those who choose not to use anti-virus software.
Read more : http://www.ehow.com/list_6150677_advantages-antivirus.html