D0NIMATRIX
Full of drivel
...And about DirectX10 and Windows. Microsoft says DirectX10 is only available on Vista. There is a DirectX10 version for XP but it is NOT made by Microsoft an it is in an alpha-stage. Quite frankly, just go with Vista to be on the safe side...
But Vista is so full of itself [and crap] that a bunch of the features won't allow some games to even play. Plus it costs a small fortune.