If you are using Windows 8, you have got Windows Defender for free. This is one of the best protection programs available for home and personal use and replaces Windows Security Essentials from Windows 7 and previous versions. (Please see http://www.techsupportalert.com/best-free-anti-virus-software.htm ) Recently I've faced issues with Windows 8 - Windows Defender automatically not downloading the update files. I thought it was related to updates not working. The fix mentioned in Microsoft Website is not suitable for Windows 8. The easy way to fix is Go to Control Panel (Windows Key + R -> control ) In System & Security -> Find and Fix Problems Fix Problems with Windows Update Run and it should fix automatically Try Windows Defender update once again
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