One of the most controversial changes in Windows Vista is the redesign of the way in which you can shut down your computer. The Log Off and Shut Down buttons are no longer in the same position even if the new buttons in Windows Vista may give you the impression that they have the same functionality.
So… where did the Shut Down and Log Off buttons go?
If you take a closer look, you will see that near those two big buttons there is a small “arrow like” button. If you press on it, a menu with 7 options will appear. Log Off is the second from the top and Shut Down is the last.
Put the Shut Down button back on your Start Menu
How to enable AMD Cool’n’Quiet or Intel SpeedStep in Windows Vista
Put the Shut Down, Log Off, Restart and Hibernate shortcuts on your desktop