I actually, despite popular acclaim, find Vista much more stable that XP - XP has done some fairly random things for me before. The most significant of this included the system ignoring my user profile and creating a new one to replace it. It was very frustrating to have to resort my entire start menu, documents folder, and personalised options such as desktop wallpaper.
For me though, despite Vista's seeming superiority over XP, I do find that the old 9x generation of Windows were faster and more stable than the next generation OSes. I remember my upgrade from 98 to XP, and was disappointed when my overall speed of boot slowed by a rather noticeable amount. If I remember rightly 95 certainly was the fastest of the batch, followed closely by 98 and 98 SE. Windows Me was something I was strongly advised never to upgrade to, so I can't really comment on it.
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