I have an HP desktop and just recently went to login when my screen froze. I hit Ctrl Alt Del and it said something like logon error etc so I rebooted but the same thing happened again. I ran Malwarebytes in safe-mode (which works fine) and rebooted again and still nothing. I restored to a previous point but that didn't help either and now when I login in, it goes straight to the black screen with a movable cursor and when I hit Ctrl Alt Del it still gives the error. The full message is:
Failure to display security and shut down options. The logon process
was unable to display security and logon options when CTRL+ALT+DELETE
was pressed. If the operating system does not respond, press ESC or
restart the computer by using the power switch.
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netsh socks resetin safe mode's command prompt. I just had the same issue and fixed it with that command. I don't know what caused it though.