Are you being disingenuous? College I work with has computer labs, sadly one is near the graphics lab where I work. IT is in there all the time servicing the Windoze (they're "dude, you're getting a" Dull computers), usually 1 in 5 has a note or sign on it "not working." One basics of creating an ad class works in there and the professor, a friend of mine, usually has to hold up every other class due to an XP machine locking up or acting wonky. I'm not going to lie, he had to do this once for a Mac (ahem)... ONCE! XPs is such a constant issue that most the students, even the peecee weenie kids, move over to a Mac at least just for that one class, not that they're converting or whatever, just you look like a dweeb when you hold up a class. Oh, did I mention the IT guys are in there all the time? They're not doing that for poops and grins, they're in there cleaning up XP, or reinstalling, or adding a service pack, whatever, I've seen them on every computer in there, well, every PC computer. Only one Mac have they had to fix (bad RAM chip).
So you're totally spinning something if you truly believe XP is as stable as OS X, sure, if you never RUN anything on it, it's solid, or you luck out. But you do actualy WORK on the thing then no, it's not as stable, or you've been the luckiest PC user ever to grace the planet, in which case, congrats, you're a miracle.