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28 May 2012  
Slartybart

x64 (6.3.9600) Win8.1 Pro & soon dual boot x64 (6.1.7601) Win7_SP1 HomePrem
 
 

I'm not sure what steps you've taken already, but a search of Microsoft has 9 results. Maybe the 1st or 2nd would answer your question.
My System SpecsSystem Spec