I recently moved over to ATI from nVidia. In personal experience I usually just installed the updated driver(s) for nVidia over the previous version to do a driver update. Should I do the same with ATI drivers, or should I first uninstall the ATI driver before installing the new one? Please advise.
While it's true that it shouldn't be too troublesome to install a driver over a previous install, and Ati is nice there because they provide a slim driver package (no control panel, use Ati Tray Tools for lightweight configuration and a much smaller download), uninstalling a previous driver is, indeed, good practice - if you go as far as removing settings recorded in your user profiles.