This software can be downloaded from Microsoft at their Windows 8 download page. You will receive Product Key via AMAZON MESSAGE within 48 hours after your payment clears. Includes genuine Windows 8 Professional Upgrade Product Key. This is brand new retail license. You can upgrade from Windows 7 or Windows Vista SP1 32-bit or 64-bit. Any edition of Windows 7, XP or Vista qualifies you for this product. System Requirements Processor: 1 gigahertz (GHz) or faster with support for PAE, NX, and SSE2 (more info) RAM: 1 gigabyte (GB) (32-bit) or 2 GB (64-bit) Hard disk space: 16 GB (32-bit) or 20 GB (64-bit) Graphics card: Microsoft DirectX 9 graphics device with WDDM driver To check if your PC meets these requirements, you can run the Upgrade Assistant.