nvidia drivers are made to work with your video card , From wikipedia : DX10 is a collection of APIs Originally, the names of these APIs all began with Direct, such as Direct3D, DirectDraw, DirectMusic, DirectPlay, DirectSound, and so forth. DirectX, then, was the generic term for all of these Direct-something APIs, and that term became the name of the collection. Over the intervening years, some of these APIs have been deprecated and replaced, so that this naming convention is no longer absolute. In fact, the X has caught on to the point that it has replaced Direct as the common part in the names of new DirectX technologies, including XAct, XInput, and so forth.
The latest versions of Direct3D, namely, Direct3D 10 and Direct3D 9Ex, are exclusive to windows vista This is because there were extensive changes in the Windows graphics architecture, and in particular the introduction of the windows display driver model. This redesign of the graphics infrastructure for Windows Vista supports virtualizing graphics hardware to multiple applications and services such as the desktop window manager , in contrast to the exclusive access afforded to DirectX applications on Windows XP. Both Direct3D 9Ex and Direct3D 10 rely on the WDDM infrastructure and WDDM drivers.
If you uninstall the drivers of your card , you will not uninstall dx10. also vista has dx9c drivers too
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