Best free windows anti virus

There are Plenty of  antivirus available for PC security,but we are confused to select the best one and to choose free or paid,today i am informing about windows free antivirus one of the best antivirus Microsoft Security Essentials.

Microsoft Security Essentials has the power to protect our system from Viruses, Spy wares and other malicious Software's,it's run quietly in background and it will do everything.MSE is easy to use small in size but big in protection.Download 32 bit from here,and 64 bit from here.