Are you using Windows 7 RC?
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The Windows 7 RC expires on June 1, 2010. Starting on March 1, 2010, PCs running Windows 7 RC began shutting down every two hours.
If you're still running the RC, your PC will continue shutting down every two hours and your files won't be saved during shutdown. In addition, your wallpaper will change to a solid black background with a persistent message on your desktop. You'll also get periodic notifications that Windows isn't genuine. That means your PC may no longer be able to obtain optional updates or downloads requiring genuine Windows validation.
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