Windows troubleshooter, windows update, and windows defender are not working :(

I'm running Windows 7, 64 bits and I suddenly encountered this problem, apparently none of these basic Windows things are working, I can't turn them on in anyway I've tried, and apparently I have no viruses in my computer. Has anyone encountered the same
problem? What could it be? Help please @_@

Hi,
It seems like system components corrupt, is there any error message when these tools doesn't work?
Please check Event Viewer if it identify this problem.
In addition, please try to use SFC /Scannow command to fix system file for test.
Roger Lu
TechNet Community Support

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