yeah, ATI Catalyst is like the Nvidia Detonators.
Download the catalyst 3.2 drivers from the website (get both the driver, and the 'control panel'). You can download Multimedia Centre and Hydravision if you want but you don't need to install those unless you need them.
uninstall any previous video drivers (i usually reboot after this)
install the driver, reboot when prompted
then install 'control panel', reboot as prompted.
then change ur settings to whatever you prefer.
if you play Half-Life (or mods based on half-life engine, i.e. Counter-Strike), then you might want to use Catalyst 3.1 (there's an issue where Half-Life will hard lock the system if you press 'esc'). I play CS and i use the 3.2s anyways cuz the new drivers made the actual game a lot smoother.