If you have more than one computer monitor and when moving your mouse from one screen to another it is on the wrong side:

Right click on an empty spot on your desktop and select "screen resolution:

In the window that pops up you will see two screens, click and drag the screens so they switch places:

click apply to make the change:

Click "Keep Changes" to make it permanent":

If you would like to change which screen your start menu appears on select the monitor you would like and tick the box "make this my main display"

Once again hit "Apply" and "Keep changes" to make the switch permanent.