windows 8 pro with media center activation problem

  thakar3 11:14 11 Sep 13

hello all, i upgraded my windows 8 single language to windows 8 pro with media center with product key i got from net, but now my windows is not getting activate, please help me what should i do now? can i downgrade it to single language again? or is there any other solution?

please do rply.

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