Earlier quoted context omitted.
Solution: run Windows in a VM, one machine per account, nuke it from orbit when-not-if something goes awry. Hundreds of hours of frustration prevented from a system that is not even able to have the same UI across all its windows.
The real solution is not to use systems who allows that.
[1] https://en.wikipedia.org/wiki/Microsoft_Windows_version_hist...
[2] All the backroom deals for Windows/Office licenses for state-use certainly helped in this regard, https://www.zdnet.com/article/linux-not-windows-why-munich-i...