Can't activate Virus & threat protection

May 26, 2018
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Settings -> Update & Security -> Windows Security -> Virus & threat protection:

"Page not available"
Your IT administrator has limited access to some areas of this app, and the item you tried to access is not available. Contact IT helpdesk for more information.

When I click ok, everything is fine with a green mark, but "Virus & threat protection" is not fine.

When I click on "Virus & threat protection" I find there in red:

Your Virus & threat protection is managed by your organization.

So a couple of weeks ago, I tried disabling the antivirus and defender settings. But now I would like to enable this all, cause I've read about flaws in system protection leading to hacking & such. I am pretty sure that is because I have restricted either a service or change something in my regedit. The first thing that came to my mind was HKLM, Software, Microsoft, Windows Defender. In there I deleted both "DisableAntiSpyware" and "DisableAntiVirus".

My 4 Windows Defender Services are on Manual/Automatic. But Defender Antivirus Network Inspection Service and Windows Defender Antivirus Service are not running, but set to Manual and the Startup type is greyed out, so I cant change it and if I click on Start I get an error stating:

"Windows could not start the Windows Defender Antivirus Service service on Local Computer."

Error 577: Windows cannot verify the digital signature for this file. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source.
 
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