Problems with Direct3D

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Because of different problems I reinstalled my whole Win7 32
After that MoW wasn'd able to find d3dx9_40.dll.

So I installed DirectX 11 form the Applications CD completely new (2x) and restarted the PC.

Now I've got the message:

Error initialising Direct3D! Device is not available (edevicescreen.ccp, 340)
>> main
>> screen:set_mode
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Men of War - v1.17.5 - standart
2010.04.20 9:12 0x009395D1


What does this mean and what can I do?