Logon screen turns black in Windows Server 2012 R2

When you try to log on to a Windows Server 2012 R2-based computer, the logon screen turns black after you enter the credentials. Then, the computer becomes unresponsive.

Note: The computer is unresponsive even if you press CTRL+ALT+DEL

Here is the fix: https://support.microsoft.com/en-us/kb/2897632

This issue occurs because an error occurs when the system tries to run the Userinit.exe process. Therefore, the Explorer.exe process cannot be started by the Userinit.exe process.

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