Helpvids explains the minimum system requirements for the Windows 7 operating system. While the minimum system requirements are explained, the viewer is also reminded that using the minimum requirements are not advisable and could cause your computer to run super slow.
According to Windows, you will require:
1 gigahertz or faster for 32 bit system or a 64 GHz processor.
1 GB Ram or 2 GB Ram if you are running a 64 bit system.
16 GB hard drive (32 bit) or 20 GB (64 bit)
DirectX Ram with WDDM or higher driver.
Again, it is advised that you actually have much higher specifications on your computer so that you are not just running Windows 7, but utilizing the system to its maximum potential.