go to the Services applet in Administrative Tools (or click Start, then Run, and type "services.msc" (without quotes) and click (OK).
find the "Themes" service, right-click and select properties, select "Automatic" instead of "Disabled" in the startup type box.
click Apply.
right-click the Themes service and select Start.
click OK.
now u only have Luna Blue, Silver and Olive Green to choose from.
go to Control Panel, select Display and then go to the appearance tab.
in the "Windows and Buttons" drop-down list select "Windows XP Style". Click Ok.
now you can choose the color scheme.