This is something bugging me for more than a decade. Occasionally there is a program hang in Windows (in this case a setup program in Windows 10 Pro), I tried to close it from resource monitor and it disappeared after a while. However the window is still shown and I cannot open a new copy of the program. I launched Process Explorer from sysinternals but this window doesn't show in the list.
What's going on? How can I shut it down without rebooting? Thanks~~