Windows 7 System Requirements Revealed
@ 2009/05/01* 1 GHz processor (32- or 64-bit)
* 1 GB of RAM (32-bit); 2 GB of RAM (64-bit)
* 16 GB of available disk space (32-bit); 20 GB of available disk space (64-bit)
* DirectX 9 graphics device with WDDM 1.0 or higher driver