- For Vista/Windows 7:  - Go to your Start Menu in the bottom left hand corner - On the bottom left there should be start search area.  - Type in dxdiag then press Enter. - The Dxdiag window should open. You may be prompted to allow dxdiag to check online for digital signatures, for which please click ‘Yes’ - On the bottom portion of the dxdiag window there should be a button that says ‘Save All Information’ - Click this and save the file as a txt document. - For Windows 8.1/Windows 10 - Go to