I'm guessing ati control center is conflicting with another program..
I'm guessing your windows disk isn't all that good
I've had the same issue, had to get a totally different OS disk.. seems fine since.
WAIT!!!! HAHA I have one..
Download this (scroll down)
Now! do this, open rivatuner.. in target adapter where it displays your graphics card.. click the little arrow pointing down..now click - low level system settings - click FAN tab, click fixed, take it to 100%... press OK, close rivatuner, run a game.. did your fan started sounding loud? correct..
^^^I've only just remembered it actually could be overheating.. I had to reread the thread just to double check my posts.. try it