Regarding xp. I never liked it as much as 2000 Pro. That was my favourite windows os until 7. I only had to upgrade from 2000 to xp because adobe forced it due to some software such as photoshop, premiere and After Effects requiring it.
XP definitely got better after sp2. Before that it felt as stable as 95. However I moved on to Vista as soon as it came out, and unlike others really liked it. Mainly because I built a new system just for it which had enough cpu power and ram; the 2 reasons people really couldn't get it to work well, which was the same problem when xp was released.
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