Currently, Vitruvius recommends Windows 10 64-bit as the operating system.
Processor - 1 gigahertz (GHz) or faster processor
RAM - 2 gigabyte (GB) for 64-bit OS
Hard disk space - 150 mb for 64-bit OS
Graphics card - DirectX 9.0 or later with WDDM 1.0 driver
See here for the supporting Windows Article about Windows 10 system requirements.
Alternatively, Vitruvius has users with these system requirements using the software successfully on Windows 7, 10.
The Vitruvius Team