I will come back to this thread and fill in some detail. Have to prepare for housekeeping and a dental appointment.
For now: I remember PC DOS, DR DOS MS DOS, from 2.02 to 6.22. I've used Windows 3.1, 3.11, WFW 3.11, W95, W98, W98SE, briefly W8 [got rid of it], now using W7Pro [ms blue-disk, not OEM]. Formerly a BATchfile-power-user, now learning more and more about Windows 7 Pro; security OPerationS, monitoring OPs, etc.