It very much depends what the computers are being used for. Whether it's preschool level or college level. Also makes me wonder why you would get the job, if your solution to computer security is coming to Gnutellaforums to ask for advice, first post even.

Is this one of the smart spam schemes, when you wait for some reply.. any reply. and then magically some robot will post the most brilliant greatest solution to you problem?

If not then feel free to elaborate. Listing operating system used would be the first thing.