Which version of DirectX is on your computer?

Applies to all editions of Windows Vista.
Which edition of Windows Vista am I using?

On a computer running this version of Windows, you should have DirectX 10 or later. Here's how to check which version of DirectX is on your computer:

1.	Open DirectX Diagnostic Tool by clicking the Start button , typing dxdiag in the Search box, and then pressing ENTER.
2.	Click the System tab, and then, under System Information, check the DirectX version number.