why don't you try Avast (Home-Free) from here...i am using it and i like it....give it a try...all you have to do is provide them with your name and email address where by they will send you a key good for 12 months...renewal only takes re-submitting an updated email address to get a subsequent key.

http://www.avast.com/eng/download-avast-home.html

slide down to the lower half of the page to download from their site for a faster download.