I have recently updated my tablet and now the orientation of the screen is sideways.

A few easy steps can correct this issue. First, press and hold onto the start button (or right click if you are using a touch pad or a mouse). Next, please select the "device manager". Select "display adapter" and press and hold (or right click) onto "Intel(R) HD Graphics". Select "Properties" and click "uninstall. Once you have done so, reboot the tablet. After the reboot, the display driver will automatically revert back to the previous version before the update. The display will go back to normal.