of course you'll require another copy of Windows XP
this is unlike previous versions, as usually people buy one, and all the PC's in home get installed with it, Ha.
as you have to activate the the windows as well.
also, to let you know, once you get windows activated, then do not change the hardware (Mobo, CPU and RAM) esle next time you'll have to call icrosoft for the acivation code opening
else u can change anythign anytime.
this activation thign sucks, I have to buy 4 Windows XP Professionals for my 2 room flat. (can u believe it)