How To Fix Windows Defender Error 577 ?

Windows Defender Error 577 : Windows Could Not Start The Windows Defender Service


Method 1 :

  1. Run dialog : regedit.
  2. Go to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender.
  3. In this key, change DWORD named DisableAntiSpyware and valued 1 in hexadecimal.


Method 2 :

  1. Search for Edit group policy.
  2. Go to Computer Configuration > Administrative Templates > Windows Components > Windows Defender.
  3. Double click Turn off Windows Defender.
  4. Select Disabled option.
  5. Click Apply then OK.