In order to prepare a DxDiag file please follow the steps below:

- Hold down the Windows key on the keyboard and press R
- On the screen you should see a window named Run. In this window type dxdiag, as seen below:

 

- After pressing the OK button you will see a new window called DirectX Diagnostic Tool. 
- In the window press the Save button, and save it to the Desktop, as seen below



Once you have prepared the file, please attach it to your message. To do this, please use the button + Add Files, as seen below: