SOLVED: Cannot Sysprep Windows 10: Failed while validating SysprepSession actions; dwRet = 0x139f
If you are trying to install Windows 10 (or Windows 8 for that matter) from an upgraded version you will see: Sysprep was not able to validate your Windows Installation. In other words, if you install the RTM July 2015 release version of Windows 10 and then install the November Read more…