Go to http://www.michaelv.org/ you can experience what was it like about 20 years. More precisely 18 years ago, Windows 3.1 was released on March 1992. The site almost cloned the entire Windows 3.1 particular the look and feel, of course the real function is altered. Internet Browser will not render the way it was suppose to be back then, instead it will just render the webpage whatever your browser renders to you. But hey at least you can try out the Minesweeper on this “Windows 3.1” it works pretty good from what I can tell.
If you are interested in all the old Windows OSs here is a list of the Windows OS up to Windows 7 by version numbers.