Cannot access the defender of the window. the start is grayed out. How to do if this problem?

In the action center told me that Windows Defender is disabled. I click on turn on and nothing happens. I go to services.msc and the startup type is set to manual and when I try to set it to automatic option is grayed out. Help, please

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For detailed information on the use of Windows Defender on Windows 8, see http://experts.windows.com/w/experts_wiki/163.aspx

Tags: Windows

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