Use the shutdown command. These are its parameters

Type these commands in RUN
shutdown -l : Logs off the current user
shutdown -s : Shuts down the PC.
shutdown -r : Restart
shutdown -a : Cancel Shutdown in progress
shutdown -f : Forces applications to close and then shutdown.
shutdown -m \\ComputerName : Remotely shutdown a PC
shutdown -t xx : Shutdown the pc in xx seconds
shutdown -c "message" : Displays a message during shutdown
at xx:xx shutdown -s: shuts down PC in specified time (time should be specified in 24 hr format for instant 21:30 shuts down at 9:30 pm).