In general, AVG is a great anti virus software and again, its free. But to my personal opinion, i am not very comfortable using avg in my laptop. I think its a little bit of RAM consuming. But that's just me, you decide what's best for you.
This is what they claimed on their website
3 REASONS TO CHOOSE AVG
- Over 100 million people trust our people-powered protection
- We’re rated #1 in threat detection by independent antivirus testing labs*
- It’s easy to install and use
The newest news is AVG Awarded Best in Class for Management Usability in Tolly Group Tests
http://www.avg.com/press-releases-news
source: www.avg.com
Click read more for download link and system requirement