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Microsoft Windows 8.1 Pro - 64bit
Size : 3.75Gb
Product ID : 72
Final version!
Windows 8.1 is a personal computer operating system that was produced by Microsoft and released as part of the Windows NT family of operating systems. It was released to manufacturing on August 27, 2013, and reached general availability on October 17, 2013, about a year after the retail release of its predecessor.
http://windows.microsoft.com/