what are the minimum system requirements for windows 7?
['1 gigahertz (GHz) or faster 32-bit (x86) or 64-bit (x64) processor*', '1 gigabyte (GB) RAM (32-bit) or 2 GB RAM (64-bit)', '16 GB available hard disk space (32-bit) or 20 GB (64-bit)', 'DirectX 9 graphics device with WDDM 1.0 or higher driver.']