I have a Windows 7 laptop from Best Buy that frequently shows the message “This computer is not running genuine Windows.” What is causing this, and how can I eliminate it? — John Mack, Colorado Springs, Colo.

Some Microsoft software updates examine a PC’s copy of Windows to determine if it’s legally purchased or illegally copied. But this examination of Windows doesn’t always work properly. As a result, some legitimate copies are flagged as illegal, and that triggers the repetitive “not running genuine Windows,” message.

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