How to download a antivirus software from internet and how to install that software?

www.avast.com

It's good and free.

How to download a antivirus software from internet and how to install that software?matchless

AVG Anti virus and McAfee virus scan are supposed to help a lot.check out http://blog.360.yahoo.com/blog-sAFtLsc8e... for more details.

How to download a antivirus software from internet and how to install that software?norton 2008

http://www.free-av.com/

here you can find the free edition of the famous free antivirus software. Just download and install it to your pc following the instructions on the screen and believe me its very very easy.
AVG , Avast are free antivirus software. Ad-aware, Ewido are free spyware removers. You can download free softwares at http://fixit.in/antivirus.html and http://fixit.in/spywareremover.html . Click on the install button to install them