This always gets me with uninstalling ATI drivers.....the uninstall drivers does not "uninstall everything" like it should.
When I uninstall using both the CCC uninstall and windows uninstall, it does not uninstall everything...if it did all of my old settings would not be there when I installed the new drivers.
Uninstall should uninstall all traces, so that when you install new drivers you should start with a clean slate.
And should not need to download seperate apps to do it!!