Alright, so here's the problem:
I run a computer lab of around 30 computers
Every morning and every day before I go home I have to shut down each and every one manually.
They're all on the same network and I am the admin, so I can do whatever I want to these computers.
Preferably, I don't want to install software, but if I have to I will.
What I want to do is
write some kind of script or use some kind of small, hidden program (so the kids can't mess with it) that will shut down the computers at a given time (say 10 at night) and start them back up in the morning (7:30am)
(Windows cronjob equivalent? I know there's something like that on Windows 7, but I've never done it in Windows XP)
Thanks for any help
EDIT: Also, no one will be logged in to these computers at the time they shut off.