Prevent changing color scheme
Supported on: Windows Server 2008, Windows Server 2003, Windows Vista, and Windows XP
Registry
HKCU
Software\Microsoft\Windows\CurrentVersion\Policies\System Value name: NoColorChoice
Description
This setting forces the theme color scheme to be the default color scheme. If you enable this setting, a user cannot change the color scheme of the current desktop theme. If you disable or do not configure this setting, a user may change the color scheme of the current desktop theme. For Windows 7 and later, use the "Prevent changing color and appearance" setting.