Stability for window XP

All depends on the user really. Almost all of the stuff people complain about has to do with what people install on the computers and how they treat them. Dragging laptops around like they are stuffed animals, installing every trial and "free" software you can find, downloading "hacks" for software, running 3 anti-virus programs at once, etc...

Win 7 has crashed on me as much as XP has (maybe once or twice a year, not counting things like a game locking up which happens maybe once or twice a month.). Vista is probably the worst one for stability.