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#11
You can mount the Software hive to check and add missing registry key.
Open the Command Prompt from Windows Recovery Environment and execute regedit.exe command.
From Registry editor select HKEY_LOCAL_MACHINE key, click File from menu bar and select Load Hive... option. Navigate to C:\Windows\System32\Config folder and select Software hive to mount it give it a temporary name as Temp.
Now navigate to HKEY_LOCAL_MACHINE\Temp\Microsoft\Windows NT\CurrentVersion\Winlogon key and let us know Winlogon is there or not.