Introduction
Download drivers from ATI website
Instructions
1) Go to the ATI website > Desktop Solutions > Video Card.
2) At the bottom of the page, download HydraVision.
3) After installing HydraVision, go to Display Properties and check Extended Primary Monitor.
4) Squares 1 and 2 will be visible in the Settings tab of "Display Properties".
Outcome
Dual monitors will be visible in Display Properties.