
When you goto the shutdown command off of the start menu, what happens? Does it freeze or does it give you a message saying "It is safe to turn off your computer"
Or, do you mean you want to have the computer shut itself down at pre-determined times when your not around?
If thats the case then I suggest looking around for a program that will put a shutdown command into your "scheduled tasks"(This really isn't my area, I'm sure someone else here can direct you to a good 3rd party program that will make this happen)
If I misunderstood your question (My universal translator was offline) then just let me know and Ill try again.
