Direct3D consists of a set of real-time 3D graphics used for communicating with 3D applications. It is included in the DirectX application and serves as the tool used for manipulating and displaying 3D images. It allows programmers to create 3D images that your video card can utilize. For games and other 3D media applications to run on your Windows operating system properly, you must first enable Direct3D. You can accomplish this task from the DirectX Diagnostic Tool.
1. Launch the DirectX Diagnostic Tool. To do so, click the Windows “Start” button and click “Run” (Windows XP users) or “Start Search” (Windows Vista users).
2. Type “dxdiag” (without quotes) and press “Enter.” Type the administrator password and click “OK” if you are prompted for it.
3. Click the “Display” tab on the DirectX Diagnostic Tool. Make sure Direct3D is enabled under “DirectX Features.” If Direct3D is disabled, click the “Enabled” button to activate it.
4. Click “Save All Information” and click “Exit” to close the DirectX Diagnostic Tool.