There are two situations when a program refuses to close after clicking the standard Close button. The first is by design, which is often the case with peer-to-peer or communication programs that remain running the background. This behavior enables continued sharing of data or receipt of calls. The second situation is when a program becomes unresponsive and can't shut down on its own. Windows 8's Task Manager resolves either scenario by trumping the program’s controls and forcing it to close.
Press "Win-X" and select "Task Manager" from the pop-up menu. Alternatively, type "Task Manager" while viewing the Start screen, and then select "Task Manager." You can also press "Ctrl-Shift-Esc."
Click "More Details" to view a comprehensive listing of running tasks on the Processes tab.
Click any listed app or background process, and select "End Task" to force it to close.
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