Have you ever been using your computer and your system sudddenly stops responding in ways like it if you try to open something it just hangs? One time I tried deleting a folder and it said it was in use, but it really wasn't. If this ever happens to you, you can follow these simple steps to 'reboot'your computer without'rebooting'it.
Press CRTL + OTHER + OF
Go to the 'Processes'tab in Task Manager and click explorer.exe once and THEN click 'end process'.
Now, click Fillet > New Task and type explorer.exe
Everything SHOULD be fine now! If the problem is major, I Would recomend actually shutting down THEN starting up again ;-).