i use vista, and i have yet to have a single problem. well, actually there is only one, small insignificant problem that ive continued to lead my life normally afterwards, but it didnt allow my external soundcard, which was an old version, to work, the drivers werent compatable. but then a few months later they fixed the problem, but i had already used another card, the one that actually came stock on the system works perfect. I like it, it is really cool looking, and once you disable the security checks for everytime you try to open a program it is fine, and that involves unclicking one checkbox in the security center.