Microsoft releases the beta version of Morro antivirus or free security essentials as a move to provide integrated security and get a hold on vast ever growing anti-virus market.
The key features of this antivirus is that update and upgrades are done automatically, its very easy to install and easier to use It gives  you get high-quality protection against viruses and spyware, including Trojans, worms and other malicious software. And above all, its avaliable free of cost to all user having geniune windows.
it is light on your system and dont use a lot of resources and above all there are no annoying alerts