Windows Defender not working in Windows 8.1

My Windows Defender isn't working.
It says update failed and cannot turn on real protection

Hi,
As Milos said,can you give us the error code or screenshot? Can you find the error log in the event view?
I suggest you reset Windows Update components to check the result.
How do I reset Windows Update components?
http://support.microsoft.com/kb/971058
Regards,
Kelvin Xu
TechNet Community Support

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