Hi. Thank you very much for the replies. So seems stable enough then.
I've never left any of my computers on for longer than about 100 days anyways (powercuts etc...) but it's nice to know.
Also, one more thing. If I buy Vista OEM it will be tied to whatever motherboard I buy, yes? So I will be able to reinstall as many times as I want, like with a pre-installed Dell or something?
Many thanks, Mark. (Sorry for all the questions.)