Windows 3.1 is an operating system released by Microsoft in 1992. It sold more than 1 million copies in its first two months.
Windows 3.1 was a 16 bit operating system that ran on top of DOS, meaning it could be run on a 286 processor, although the Win32s addon did give Windows 3.1 a degree of compatibility with the 32 bit API used by Windows NT.
Windows 3.1 was superseded by Windows 95 in 1995.
This guide takes you through the history of Windows from the earliest versions through to modern versions of Windows such as Windows Vista and Windows 7.