My first PC was a pass-me-down gift from my aunt and it was just Norton Commander with a bunch of games pre-installed on it, I don't even know what OS it was because at the time I thought Norton Commander was the OS.
@Gargron I had installed windows 7 maybe for longest. But windows 10 isn't that bad as many says. I think it is best from Windows 7 era. YES it has some bugs, but which operating system doesn't have them?