How to close an ad for Windows 8.1 in Windows 8

  callie123 18:29 19 Jan 2014
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An ad to upgrade to Windows 8.1 has appeared across the screen of my mother's laptop (which is running Windows 8). She can't figure out how to close the ad. It doesn't appear to have an X, or any other visible buttons for closing it, only the option to 'Go to Store'. I can't help because I can't see her PC to have a play around with it. Any advice please!

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