|Did you try the "standard" way?|
Right click a free area of the desktop, select "properties"
Click the "settings" tab
Click the mouse on the seconary monitor grapic,
UNCHECK the box "extend my Windows desktop onto this monitor"
Click the primary monitor graphic
Make sure that "use this device as primary monitor" is CHECKED
If you're not sure which is 1 and which is 2, tap the "identify" button. It should display a huge, gigantic "1" on the primary monitor.