Kaspersky is one the best Anti Virus I have used. It has some really good protection and is also pretty lightweight and does not hog on CPU resources as many other AV do.
If you want to get your hands on a Kaspersky Antivirus 2011, now is the right time. Buy.com is selling Kaspersky 2011 3 user license or only $13.99, that is a $46 markdown from the original $60 price. The deal is limited for today only so go ahead and get a really cool Antivirus protection for your PC this Cyber Monday.