Windows 3.x was a family of Microsoft Windows operating system, released in 1990-1994. Notable operating systems in this family include Windows 3.0 and Windows 3.1. This Windows could run in either Standard or 386 Enhanced memory modes. Both of the modes used a Graphical User Interface (or picture-based), and supported a mouse, but 386 Enhanced Mode was faster and was better at multitasking (or doing many things at once). Windows NT 3.x was released in 1993-1996.