Elitegroup NVIDIA VGA cards - Manual (Page 6)

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3.2. Install DirectX
DirectX maximizes your VGA cards’ p erformance, stability and
security. You can skip this step if your operation system is Windows
XP SP2 or above.
Step 1:
Select <DirectX> in the Main Menu.
Step 2:
Install DirectX step by step according to the instructions on the
screen.