And here's Windows 2000 in a browser:

https://bellard.org/jslinux/vm.html?url=win2k.cfg&mem=192&gr...

And Windows 95 in a browser:

https://copy.sh/v86/?profile=windows95

And Windows 3.1 in a browser:

https://www.pcjs.org/software/pcx86/sys/windows/3.10/