Windows defender will not turn on

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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John TsioumprisSoftware & Systems EngineerCommented:
It seems that this is a bad registry error
Check this:
Navigate to the following keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender
and change
'DisableAntiSpyware'  from '0' to '1'.
'DisableAntiVirus' from '0' to '1'.
retry again....possibly needs a reboot after editing registry
Kundan GuptaSenior AdministratorCommented:
Press Windows key + X key.
Select Control Panel => Programs => Programs and Features.
Look for the AV, highlight it and click Uninstall.
Reboot and try to launch Win Defender.
RaminTechnical AdvisorCommented:
1.Press Windows key + X key.
2.Click Command Prompt (Admin).
3.Type ‘sfc /scannow’ without the quotation marks and hit Enter.
4.Wait until the process completes.
 If some defective files have been detected but could not be restored, type: dism /Online /Cleanup-Image /RestoreHealth  press Enter (this step requires an active Internet connection to access Microsoft servers).
 Wait for the procedure to finish and repeat step 3.
5.Exit Command prompt, reboot the PC.
LiefrAuthor Commented:
I have tried all of these suggestions and none of them have produced a desired result. I am using a third party AV. Thanks for trying.

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LiefrAuthor Commented:
The suggestions were not effective in my case.
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Windows 10

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