Most likely you're getting the error due to the Link Removed due to 404 Error, the feature present in Vista and 7. It can be caused by any faults in the way between the video card and the screen, or it can simply indicate a hardware fault with your GPU.
Link Removed due to 404 Error
I would try getting the latest and completely reinstalling ATI drivers as well as all of the ATI software like CCC, Hydravision, Avivo. There is a chance it will help.
Link Removed
In theory, it also could be your motherboard bios that you need to upgrade as ATI 5000 series are so brand new. But make sure to consult ATI support first.