On computers running Windows Pro, a Group Policy rule can be used to block access to the classic Control Panel. This makes sense, for example, if you need to allow a less experienced user access to the machine and don’t want them to unwittingly stop something.
Control Panel
How to speed up the task manager when shutting down?
If Windows always gives a Waiting for Task Manager… screen message when it shuts down, it means that the operating system is waiting for Windows tasks that are still running to complete properly.