The Fourth Dimension: Windows for download

Bored of using XP or tired of using Vista? Go in for a version change then. How about getting the earliest version of Windows(just to see how far the OS has come)? These versions don't require tons of RAM(a mere 16MB stick is enough) or demand too much clock cycles(just 60Mhz suffices).
Take a look at these screenshots, you'll realise that the timelines of Windows OS and general technology are almost parallel.

And oh..these OSes should be installed from floppy disks :)

The first version of Microsoft Windows, version 1.0, released in November 1985, lacked a degree of functionality and achieved little popularity, and was to compete with Apple's own operating system.Windows 1.0 is not a complete operating system; rather, it extends MS-DOS. Microsoft Windows version 2.0 was released in November, 1987 and was slightly more popular than its predecessor. Windows 2.03 (release date January 1988) had changed the OS from tiled windows to overlapping windows. The result of this change led to Apple Computer filing a suit against Microsoft alleging infringement on Apple's copyrights.
Microsoft Windows version 3.0, released in 1990, was the first Microsoft Windows version to achieve broad commercial success, selling 2 million copies in the first six months.It featured improvements to the user interface and to multitasking capabilities. It received a facelift in Windows 3.1, made generally available on March 1, 1992. Windows 3.1 support ended on December 31, 2001.