Some (older) games may not perform well when playing in Full Screen mode. To improve the performance of the game, we recommend switching to Windowed Mode.
If you can access the options/settings menu in the game
Locate the Full Screen option and untick/deselect it and save these settings. The game will now display and open in Windowed Mode.
If you cannot access the options/settings menu in the game
Once the game is opened, press the ALT and ENTER keys on your keyboard to force the game into windowed mode (smaller screen). Once in Windowed Mode, head to options/settings in the game and untick/deselect the full screen option.