When another AV is installed, Defender gets turned off so the two won’t impede each other’s work. In Windows 7 and earlier versions of Windows it used to have anti-spyware functions only and could run alongside third-party AV’s, but in Windows 8 it has become a full-fledged antivirus. Windows Defender is an antivirus and anti-spyware utility that comes with Windows OS. Most of the time fixing error 577 is as easy as uninstalling third-party antivirus programs, but some cases are more difficult.
Error 577: Windows cannot verify the digital signature for this file…” You might have seen this error message when trying to launch Win Defender. “Windows could not start the Windows Defender service on Local Computer.
Why did error 577 occur and how to get rid of it
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