What is the best anti-virus software?
top ten for you, here:http://anti-virus-software-review.toptenreviews.com/As far as free ones go, I suggest Superantispyware.
It doesn't exist, as soon as a cure is found the hackers go right back to work. The best way is to join 1 of the companies that are able to constantly change along with the viruses, worms, Trojan horses etc.
the best anti-virus is kaspersky internet security 2013
For Windows, Windows Security Essentials.
I would recommend Avast; it's relatively powerful, reliable, not bloated and free!