Hmm, I don't have any pathetic laptops with anything later than Windows XP on them. Is Vista+ an actual requirement or just something in the System Reqs because it's unknown territory?
Well, I say you could just check. The worst that would happen is that it just won't run, and I'd wager a guess it's probably the latter (“unknown territory”) due to the fact that most people simply don't have anything with a pre-Vista Microsoft OS.