Laptop video cards are very sensitive to the drivers, it is very likely some Windows update caused an issue. When you did a clean Windows setup, did you use the drivers from Acer support site? If not, do that. You will need to install the nVidia and the Intel drivers both from them or dual graphics may not work properly. Make sure the nVidia card is selected as the main card for your games, you may need to set it manually for each game.