請問顯示屏晝面倒轉, 如何恢復?

I never used Windows Vista before, but a quick Google search allowed me
to discover
the correct shortcut that you can use to turn your computer display
back to normal: the shortcut Ctrl + Alt + Arrow key
shortcut rotates the display in 90 degree increments.

我都有試過，如果是Window7的話可以按控制台→外觀及個人化→顯示→螢幕解析度:在方向按(橫向)