I had Vista and wanted to directly upgrade to Windows 8.1 with the full version. However, the installation of VISTA not worked out, but the program always asked after the previous version 7 or 8. Call in the Windows hotline was told. that since I had to change something in the BIOS of the PC, - which the hotline also should not make. Then I must give the PC for installation to PC specialists. This had cost me an additional 80. Otherwise, this program version, -after getting used to act good overall. Delivery without the extensive packaging waste I found also good.