Please un-install all AMD/ATI video stuff from Control Panel...Programs...Un-install a program
Then, download (but DO NOT install) a fresh copy of the ATI drivers from http://ati.amd.com
(in the upper right corner of the page)
Use this procedure to install the DRIVER ONLY
If the device (AODDriver or AODDriver4.01) remains a problem, open Device Manager, select the "View" item.
Then select "Show hidden devices" and scroll down to the Non-Plug and Play Drivers section.
Locate the AODDriver entry, right click on it and select "Un-install". Reboot for changes to take affect.