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. Windows could not start the Windows Defender Service service on Local Computer.Įrror 577 : Windows cannot verify the digital signature for this file. However, once I tried to start the service, I received an Then I had the idea to check out the Windows Defender service and make sure it was running. So I then went to Avasts website and downloaded and ran their specialized uninstaller, but this didn’t help either. So I thought this would be truly very easy uninstall Avast and turn on Windows Defender, or so I thought.Īfter uninstalling Avast (which now has too many pop-ups) I went into the Action Center to reactivate Windows Defender.īut no matter what I did (that is, no matter how many times I clicked on the “Turn on now” button, nothing happened- no error, no message, nothing) I was recently trying to fix my father’s computer (Windows 8.1) by removing Avast antivirus and reactivating Windows Defender which is natively part of Windows 8.1.
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