I voted for Linux even if it is pissing me off at the moment. My seconded would be Vista. My pc with Vista has not crashed since I bought it. The pc with Ubuntu has crashed about once a day since the last auto update, and Flash and Firefox have decided not to play together anymore. So maybe in a few days I might change my mind.

*I used google and read some stuff (very shocking I know), and fixed my problem. So I am a happy Linux user again. hmm until next time*