DirectX version 11 is the next generation of Microsoft graphics technology. This is a great news for those who play games on Microsoft Windows as many of the newest Windows games will take full advantage of this technology to create a vivid world of imagination. DirectX 11 comes pre-installed with Windows 7, but it is not available for Windows XP. On Windows Vista, you can install it through an update.
Before you can use DirectX 11, you need a DirectX 11 compatible graphics card. Those who already have a DirectX 11 hardware (like the ATI Radeon HD 5000 series) can install DirectX 11 in Windows Vista and start enjoying it.
You can download Update for Windows Vista (KB971512) from http://support.microsoft.com/kb/971512 window.
. Please note that you must have Windows Vista SP2 before you can install DirectX 11 on your computer.
After the installation of the Update (KB971512), Windows Vista would restart. Upon restart you would have DirectX 11 installed on your computer. You can check by running DxDiag. To run DxDiag, open a run dialog by pressing the key combination Windows logo key + R. In the Run dialog, type dxdiag and press Enter. You would be able to see the DirectX version as shown :