I've had Windows 10 pc for about 3 months now, and that whole time I've been using a display resolution 1920x1080. Yesterday my screen resolution was changed to 1600x1200 and my pc wont let me switch it back, I shut off my PC and turned it back on and my resolution was changed back, how ever when I started my PC today it was back to 1600x1200 and no matter what I do it wont change it back, when I got to the control panel to change my resolution I wont go any higher than 1600x1200. I know my monitor can display 1920x1080p 60Hz becuase up to a couple hours ago it was doing just that. Does anyone know what to do.