- Right click on Desktop
- Select Screen Resolution
- Click Detect (with no additional monitor connected)
- Next to your first display, you'll see a grey square with the text "Another display not detected" Click on the grey square
- Next to "Multiple displays" it will say "No display detected"
- Click on "No display detected"
- A drop-down menu will appear
- Select "Try to connect anyway on: VGA"
- Click on your primary display (the square with the big "1" in it)
- Next to "Multiple displays" select "Extend these displays"
Alternatively watch the video; http://www.youtube.com/watch?v=2M9xOXxwK1g