Black login screen in Windows Server 2003

One day, Windows Server 2003 began to issue a mourning (gothic?) Greeting. It looks like this

This had no effect on the operation of the system, but it was problematic to enter the password. There was no solution in runet. But one of the forums in English found a topic with an exact description of the problem, the causes and solutions.

As it turned out, the cause of the phenomenon is ... lack of free space on the system disk. For no apparent reason, the registry settings are reset. After freeing the space, the settings must be manually returned.

And so, the following settings

[HKEY_USERS \ .DEFAULT \ Control Panel \ Colors]
"ActiveBorder" = "212 208 200"
"ActiveTitle" = "10 36 106"
“AppWorkSpace” = “128,128,128”
"Background" = "102 111 116"
"ButtonAlternateFace" = "181 181 181"
ButtonDkShadow = 64 64 64
ButtonFace = 212 208 200
ButtonHilight = 255 255 255
"ButtonLight" = "212 208 200"
ButtonShadow = 128,128,128
"ButtonText" = "0 0 0"
"GradientActiveTitle" = "166 202 240"
"GradientInactiveTitle" = "192 192 192"
"GrayText" = "128 128 128"
"Hilight" = "10 36 106"
"HilightText" = "255 255 255"
"HotTrackingColor" = "0 0 128"
"InactiveBorder" = "212 208 200"
"InactiveTitle" = "128 128 128"
"InactiveTitleText" = "212 208 200"
"InfoText" = "0 0 0"
"InfoWindow" = "255 255 225"
"Menu" = "212 208 200"
"MenuText" = "0 0 0"
"Scrollbar" = "212 208 200"
"TitleText" = "255 255 255"
"Window" = "255 255 255"
"WindowFrame" = "0 0 0"
"WindowText" = "0 0 0"

After making corrections, the welcome window returned to the standard view.
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It makes no sense to start holivary, but this behavior of the server (!) OS from Microsoft is very strange. Why, when the place is full, the settings in the registry are overwritten, only the UFO knows.