http://www.ati.com/support/driver.html
If you haven't already, go here and get the latest Catalyst Drivers 4.1
Go thru the steps of selecting your OS then Graphics Driver, Radeon Family and select the 4.1's with the Control panel included. Around 25 megs.
Uninstall the crap that came with your card and run the install of the 4.1
You will then be a very happy person and things will run as they should.
Welcome to the ATI family. Life is now good.
One other thing... Your refresh should be atleast 85hz unless you are running above 1280x1024 then you might want to hang around 75hz or your moniter will go pffffttttttt ...