I just did a new build AMD FX8150, Windows 7 64bit, Samsung 830, dual Nvidea 550 TI, 1 GB DDR 5. I have applied all windoiws updates, but my windows system rating still indicates tha I am running Direct X 10, BTW my rating is a resonable 7.8
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Win7 always show directx 10 cause WEI just test dx10. If you notice when test, you will see. Better check with a dx11 supported game.
Type dxdiag start menu search box, and open it. In display tab, check the DDI version if it is 11. If not 11 then install latest DirectX version as posted above.