So I installed a fresh install of Minecraft. I'm running Windows 10. My install of Windows is also fairly new. My Java is up to date, all my drivers are up to date, and my ram for Minecraft is set at 3 gigs. I've tried changing all of the graphics settings and nothing works. The only thing that fixes the flickering is being in Windowed mode. It seems like the sky flickers on top of the entire window. It even covers the menus when I'm changing options. I've never had this happen before, and I have no idea what might be causing it. The version of Minecraft doesn't seem to make a difference. It happens on 1.8.9 and 1.12.2, I've tried it on both. The server doesn't matter either, as it flickers on any server and in singleplayer. Please help?