When you try the following article it might work if you try it from a Clean Boot so that none of your currently running programs, especially security and anti virus programs can interfere. Media Center - Remove and Go Back to Windows 8 Pro How to perform a clean boot to troubleshoot a problem in Windows Vista, Windows 7, or Windows 8 Another option that might work is to contact the Windows Activation Center and see if they can help you with a newly purchased Media Center Product Key which you can offer to pay for.

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You have to let all the recorded prompts die off and stop, do this by ignoring them until a real live person answers the phone. They should easily fix your activation problem for you. How to contact a Microsoft Product Activation Center by phone Microsoft Volume Licensing Activation Centers Worldwide Telephone Numbers Global Customer Service phone numbers. Are you saying you have two editions of Windows 8 but only one Media Center Key? Can you elaborate on your problem to make it a bit clearer?