DirectX is all there in Windows Vista and Windows 7, but the game probably
uses extra libraries like the Visual Studio runtime, D3DX, XAUDIO2, XACT3,
etc. that have to be installed.

Running the latest DirectSetup End-User Runtime setup will install all the
various realted technologies that games use, but DirectX itself is already
built into every version of the OS since Windows XP SP2.

http://msdn.microsoft.com/en-us/libr...42(VS.85).aspx

--
-Chuck Walbourn
SDE, XNA Developer Connection

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