yeah you can change ur product key through the activation window
dunno about vista bu in xp, as a meaure to stop to stop hackers trying to enter keys until it eventually activates properley, they made it so you can only change it a limited number of times
but even then there is ways
and yeah, windos 7 should be good. Who here has tried server 2008? i know its supposed to be based on vista sp1 codebase, but it seems a wee bit faster than vista on the same hardware, even with the server stuff on, and the desktop stuff like themes and media player installed.
obviosuly some tweaking went on. maybe windows 7 may be a bit faster