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I take it they are Windows machines... and that your intention is more to stop them from using them than to protect the data.
(After all... it sounds from your description like they watched DVDs...)
I would apply a windows password. Log in then lock a session at the end of the day. Lock (not log out). They'll be afraid to reboot then because
a) it'd be obvious - they can't log in then lock the session upon reboot unless
they know the password
b) it'd potentially loose legitimate work - giving you cause for complaint
Second.... I'd set a BIOS password. This prevents them starting any OS after a reboot. Take care not to loose the BIOS password !!
Finally - if you are also worried about file security, apply read up on and apply some sort of file encryption. It's not foolproof, but it sure helps.
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