We all know that Windows8 comes in built with a full blown anti-virus aka Windows Defender. Also Windows7 and XP users can use Microsoft Security Essentials on their pc. Microsoft has made a solid product although they have flunked some major tests recently. Some swear by it and some cant relate microsoft with security. Combined with the Smart-screen filter in Windows 8 it is a great and potent light weight solution. So how many of you use Windows Defender or MSE or plan to use them? Tell us why you use them. Personally I am not using them at the moment. But I used it for a month or so with Comodo Firewall and it was a great and light-weight and non-obtrusive experience.