You need to be a bit more precise, ofcourse 6.3 won't work with DX10 as its a DX8 3D Engine. Maybe you wanted to say, that it doesn't work with Vista? In this case there are already different threads in the forum about this issue.
HOlY $&#^ you guys are
TOO NICE on these forums, aren't ya?

Treating silly ignorant spam-questions like that with an attempt at help... I mean, wow!