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Windows 3.1 is the primary OS of choice. And though it crashes at a blink, has a clunky interface and needs at least 4 MB of ram to run well.
Boy your memory is shot or you didn't have much knowledge of windows back then. Windows 3.1 and 3.11 were well ahead of their time and ran flawlessly on top of DOS 5-6.2 even on my old POS 386sx with 1MB of RAM. The interface was fairly easy to use for its time.