Here is how to calibrate your Promethean Board using the Windows 7 taskbar.
1). Select the triangle on the bottom right of the taskbar of a PC.
2). Select the Promethean icon – PC (You will find this icon in the menu bar at the top of the screen on a Mac)
Select calibration from the menu. Then select 5 points.
Calibration points will appear on your Promethean Board. Follow the on-screen directions.