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Click the Start Button.
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In the search box type C:\\Windows\Globalization\MCT
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Windows Explorer will show you a window with additional themes. These will be from Great Britain, South Africa, Australia, and Canada.
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You will have the option of selecting either the wallpaper or the whole theme
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You can install the new theme by double clicking on the required file.
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The new theme you added will show under My Themes inside the Personalization pane.
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You can also download additional themes from microsoft.com. You may not need to now that you've found the hidden themes.