I think I know what might be wrong. My laptop had the same problem when in tried to install the ati driver. What fixed it was uninstalling the driver deleting the ati folder and then using the catalyst driver installer as apposed to downloading the complete driver package.
I uninstalled everything and the Complex 3D test that I was trying to run when I get the error, worked, but it gave me a VERY LOW score that I don't think is reflective of my hardware, I have the 5770 and one of the comparison results had a 3870 and they got a much higher score? that doesn't seem right.