http://blogs.technet.com/b/askcorejp/archive/2015/07/23/windows-update-windows-10-1.aspx
reg add HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\WindowsUpdate /v "DisableOSUpgrade" /t REG_DWORD /d 00000001 /f
http://blogs.technet.com/b/askcorejp/archive/2015/07/23/windows-update-windows-10-1.aspx
reg add HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\WindowsUpdate /v "DisableOSUpgrade" /t REG_DWORD /d 00000001 /f