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c:\windows\system 32\Shutdown.exe -s
make sure you add the "-s" switch
shutdown.exe alone only logs you off
there are other switches that you might find useful
-r : Reboots after shutdown.
-f : Forces running applications to close.
-m [ \\ ComputerName ] : Specifies the computer that you want to shut down.
-t xx : Sets the timer for system shutdown in xx seconds. The default is 20 seconds.