This post describes how to fix: Windows could not start the Windows Defender Antivirus 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. Cause This error can occur when you try to start the Windows Defender Antivirus Service and Windows Defender has been turned off in group policy. Resolution Turn Windows Defender on in Group Policy.  For more information, see Related Posts. Related Posts -  Your Virus & threat protection is managed by your organization

This post describes how to enable Windows Defender when the following is shown: Your Virus & threat protection is managed by your organization. Cause This message is shown when Windows Defender is turned off in group policy: Resolution Disable the 'Turn off Windows Defender Antivirus' group policy setting then run gpupdate in a command window. You can verify Windows Defender is now enabled by checking the value of the DisableAntiSpyware key is 0 in the registry. HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\DisableAntiSpyware Virus & threat protection will now say: Threat service has stopped. Restart it now. Press Restart now and Windows Defender should now be enabled: Related Posts Error 577: Windows cannot verify the digital signature for this file

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