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If you did an Anytime Upgrade from one edition of Windows 7 to another, Activation can be unsuccessful if you did not activate the base license. For instance, suppose you bought a Netbook with Windows 7 Starter installed, then you did an Anytime Upgrade to Windows 7 Home Premium (read full report). If the Windows 7 Starter was never activated, then the Windows 7 Home Premium license will refuse to activate since the qualifying license cannot be determined to be genuine. Work around, you will simply have to reinstall the base license, activate it then do the Anytime Upgrade to Windows 7 Home Premium again (unfortunately).