For the ATI card, run the downloaded file, and let it extract to a directory, and then cancel the install. I don't have the files in front of my, so I don't remember the exact path, but if you look into the new directory and dig through some of the files, you'll find the
driver files. They are pretty obvious once you look there.
Once you do, you install manually, through Device Manager. Find the card, right click to update
drivers, and point that wizard to the ones in the new, extracted directory. Reboot, and then run the downloaded Catalyst file normally, and let it install as you normally would.