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In Windows 7 DirectX 11 is baked in and can therfore not be uninstalled ).ĭescription of the platform update for Vista SP2 :

What pulls DX11 into Vista SP2 ( 6002 ) is the so called "platform update" that comes with Windows Update as an "optional but recommended update", which makes Vista SP2 make more Windows7 compliant. Vista SP1/Sp2 ( 60 ) comes with DX 10.1 by default, an update to the original DX 10.0 in Vista with no Servicepack installed ( vista build 6000 ). For starters make sure thath you have the latest drivers from NVIDIA.ĭirectX11 CAN BE UNINSTALLED ( on Vista ), answer above is incorrect. He might have different programs running in the background, different driver versions for various components, different BIOS version for motherboard or graphic card, different PCB (Printed Circut Board) for motherboard and graphic card, different Power Supply Unit (different amperage on +12V rails which is important with moder graphic cards), and so on. And your brother may not have "the same setup" as you have. In my humble opinion it is unlikely that the problems you are having are due to DirectX 11. And there are a handful of games that use DirectX 11.

However, DirectX 11 is only used when an application wants to use it (from what I understand DirectX 11 is separate from DirectX 10 or 9.0) and if your hardware supports it (so it won't run at all in your case). Either way DirectX 11 was probably installed from this update which required SP2 (so it was installed after you have installed SP2). You may want to use System Restore to restore your computer to the point in time before installing DirectX 11.