Best free antivirus for Microsoft Windows

As I am an IT person, lot of friends and colleagues ask me which is the best antivirus for my system. I will suggest Microsoft Security Essentials as the best and free Antivirus solution mainly due to the reason that it is from Microsoft and is free. It does its job of keeping your system clean from Virus and Spyware. You have to have original Microsoft software including OS installed on the system. 

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