How to kill Vista's explorer.exe in 3 clicks.
The usual way of terminating the explorer process is through the Task
manager. Rt-Click taskbar > Task manager > Process Tab > Rt
Click explorer.exe > End Process.
But Vista actually offers you a faster way to do it ... in 3 clicks !

Click Start button > Hold down Ctrl+Shift & Right Click on empty area in the Start Menu > Click "Exit Explorer".
To re-start it, you will have to do so as usual through the Task
Manager. Click Ctrl+Alt+Delete and select Star Task Manager or press
Ctrl+Shift+Esc. Then launch explorer.exe manually.