Solved : 3D games rotated my computer screen

3D games rotated my computer screen

I recently discovered a new problem when I playing a 3D game on Windows 7. That is Automatic screen rotation from landscape to portrait & PC screen resolution change from 1366 x 768 to 800 x 600.
I tried to get a Task manager using Ctrl+Alt+Del. After I quit that game nothing changed.
I am also tried to restart my system. Button the problem not solved.
First, you need to change your computer orientation from the rotation to normal. That means portrait to normal. So right-click in Desktop and choose Screen resolution. Change orientation from portrait to landscape, also change screen resolution.
If you want to permanently avoid this problem?
Graphics and media control panel