Bearing in mind it takes 30 mins to log on to a school computer anyway, running Linux is obviously an improvement. Also, every person in our school has modified or cheated the school system in one way or another, It's 1300 people wondering why one of the best funded IT departments in the county supplies us with such terrible equipment...
He isn't destroying the property, just adapting it to work best for
him. All ICT has to do is reinstall windoze, and it'll work again. And since he's done it only on 2 or 3 computers, it's hardly going to kill the budget of the school...
It's nothing he hasn't done on his own computer. Anyway, he's a good bloke, He doesn't write malicious software, just helpful software.