I know I know: I'm paranoid. But just because you're not paranoid doesn't mean they aren't after you
Don't we all are a bit paranoid? - If you want security you have to test it, not just think it will work.
However, for XP MS offered (until recently, I think it was withdrawn) something like a kiosk mode. I.e. you could lock down an XP quite thoroughly. Would have to ask in the forum whether someone still has a copy around. I don't even recall the name of the tool, but it got "advertised" on heise.de.
Do you think of the "Shared Computer Toolkit"? - I have got a copy.
Bernhard