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Can any one suggest me how to check weather an Vista system is using XPDM or WDDM programitically?

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Short summary tied to the thread: already hit the right approach by using the Direct3D9Ex path; the snippet below is a compact, copy-pasteable C++ check you can drop into a native app to decide at runtime whether the system exposes the newer (Vista+) D3D9Ex runtime (i.e., the environment that supports the newer driver model).

#include <windows.h>
#include <d3d9.h>
#pragma comment(lib, "d3d9.lib")

// returns true when D3D9Ex is provided by the runtime (Vista+)
bool IsWDDM()
{
    IDirect3D9Ex* pD3D9Ex = nullptr;
    HRESULT hr = Direct3DCreate9Ex(D3D_SDK_VERSION, &pD3D9Ex);
    if (SUCCEEDED(hr) && pD3D9Ex)
    {
        pD3D9Ex->Release();
        return true;
    }
    // log hr for diagnostics if needed: printf("Direct3DCreate9Ex failed: 0x%08x\n", hr);
    return false;
}

Notes and troubleshooting:

  • Run this on a local session when diagnosing graphics drivers; virtual/remote sessions or temporary display drivers can hide the real driver model.
  • If the call fails, log the HRESULT (hex) — that helps distinguish “no D3D9Ex runtime” from other errors.
  • This check requires Vista or later; older XP systems never expose D3D9Ex even with updated DirectX runtimes.
  • For apps that use D3D10/11, detect the adapter/runtime via DXGI (your feature-detection should follow the API family you actually use).

Acknowledgement: pointed toward searching, and provided the practical route; the code above shows how to implement that check and how to diagnose common failure cases.

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