Did anyone tried to update from Windows 8 to Windows 8.1 using the Windows 8.1 Setup? I am very keen to test the update from Windows 8 Enterprise - Windows 8.1 Enterprise I am getting the following error message You can't install Windows 8.1 because your processor doesn't support CompareExchange128 Any Clue? I am trying on Virtualbox Latest version and Windows 8 Enterprise x64