I think The problem is with your ATI drivers.
Try to update your Drivers to the latest version thats CATALYSt 3.2 You can Download The CATALYST 3.2 From Rage3d Here is the link
Rage3d
After downloading the driver, Unistall the old drivers In the ADD/Remove Program section then delete the ATI Folder That is in C: ( where Your OS id installed).
Then install the new driver and restart your Computer.