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Windows defender will not turn on

Liefr
Liefr asked
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Last Modified: 2017-08-19
I get error 577 when trying to start the Windows defender services. This is 'Windows cannot verify the digital signature for this file.' it goes on for a bit.
I am using windows 10 latest updates.

I have no other anti-virus installed. I had Superantispyware installed but removed it trying to solve this problem. Windows firewall is active.
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The suggestions were not effective in my case.