Preface:
You should NOT enable DirectX and Graphic Acceleration on this OS. It is a server, and is meant to be used as one.
Method:
Right-click on your desktop and select Properties
Go to the Settings tab and click Advanced
Go to the Troubleshoot tab and move the slider to Full
Press OK and OK.
Now go to Start->Run... and type dxdiag, after a little wait the progress indicator should disappear. Now go to the Display tab and make sure the 3 DirectX features are Enabled
You've just enabled DirectX and Graphics Acceleration
