Binary Expressions

To determine what version of Microsoft DirectX you have installed follow the below steps.

• On the taskbar, left mouse click once on “Start” then left mouse click once on “Run..” (or on the keyboard press and hold the Windows Key and then press letter “R” key).
• In the “Run” dialog box under “open:”, type without quotes “dxdiag”.
• Left mouse click once on “Ok”.
• When done left mouse click once on the “Exit” button.

If you have Microsoft DirectX installed you should now see a “DirectX Diagnostic Tool” dialog. Under “System Information” you will see the version of DirectX under “DirectX version”.

Source: Microsoft DirectX: Home Page
Source: Download Microsoft DirectX