Uninstall everything related to ATI from your computer(VERY important to erase everything related to ATI). Go to Remove Programs and use the ATI Uninstall utility.

1. Then go to Control Panel
2. Select the System Icon
3. Choose the Hardware tab
4. Click on Device manager.
5. Here check out Display Adapters (double click on it to extend the list of adapters available).

- does it say Radeon 'your model' Series?
- does it say Radeon 'your model' Series Secondary?

If so, disable the first one on top by right clicking on it and choosing disable.
Your computer will want to reboot. Let it reboot.

After the computer reboots
1. Go to www.atitech.com and download the most recent driver package for your card.
2. Install it.

Once the installation is complete your computer will reboot and the problem should be fixed.

It is posible that you will not remove everything related to ATI and still remain some hidden files somewhere, if the above steps don't work you can consider formating your windows partition, this procedure is also known as Clean Install.


Did you by any chance change from nVidia to ATi? If you haven't done so already try uninstalling the drivers again and then run Driver Cleaner (http://www.drivercleaner.net/). Be sure and follow instructions exactly. Run cab cleaner first and then, if you had and nVidia card before, run it to clean both nVidia and ATi drivers.

You could also try installing thru Device Manager and see if that works.

Also, it might be that some crucial system files in Windows might be lost. If drivercleaner fails to cure your problem, try to use the REPAIR function on your Windows CD (this takes a while... you have to let the CD go through its initial part of the setup before you get the choise of "intall new" or "repair existing"..