Re: Nvidia GPU
You mean those big green dot at the upper left corner? It doesn't appear to be serious because the screenshots show you having good graphics and I can see everything.
Uninstall all games affected then, remove your video card from your system and reinstalling it again. Physically pull it out and back in, reinstall new drivers. Install game one at a time to test. Don't know if it will work, but worth a try.
*Fact: Microsoft Window's Blue Screen of Death vs Computerforums.org's White Screen of Death. Which is worse?