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 window color and appearance' setting. Fix: (1) GPO: User Configuration\Administrative Templates\Control Panel\Personalization!Prevent changing color scheme (2) REG: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System!NoColorChoice