-Right-click on the Windows 8 Desktop and select “Personalize” option. -Select “High Contrast #1”, and then click “Window color”. Do not click “Save changes” or “Apply” option and leave the window open.
-By keeping the above window (Window color and Appearance) open, once again right click on the desktop and choose “Personalize’ option. -From the personalization window, select a default theme. When it saves your selection, click on “Save changes” option in the first window (Window color and Appearance). That’s all! [via]