Use the hotkey defined in the video software to rotate the screen. Only
you know what video software/drivers you have installed. Unless you
disabled it, most such software sticks an icon in the system tray for
you to use its menues to perform actions, like rotating the screen.
It's a feature of your video card, to support using a monitor that
works in portrait orientation. Try Ctrl-Alt-Up Arrow (or sometimes
Ctrl-Shift-R).
It got that way because you hit that key combination by accident,
without realizing it.
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