From the pop-up window, navigate to the folder where ESO is installed and select ESO64.
In addition, you should ensure your video driver is selecting the correct GPU for ESO by opening either the NVIDIA Control Panel or AMD Radeon Settings and ensuring that ESO64.exe is making use of your primary GPU. If you have confirmed that your machine meets the minimum system requirements for The Elder Scrolls Online, you should try the following troubleshooting steps: