Completely uninstall the drivers for your GF3, in add/remove programs. Then use a tool like Det. Destroyer to completely uninstall the registry entries for the Dets. You can look in
www.nvnews.net for directions on how to do this (in the forums)
Then make sure that power connector is connected in with your PSU on the 9700. Install the cats and the cntrl panel. You might wanna stick with the 3.1 cats if you play CS, or any Halflife based games, because there is a problem with 3.2 cats.
Then crank up the AA, and AF in the cntl panel after your reboots. Have fun! Also your PSU needs to be at least 300watt to push that card. 9700 won't run 3D aps without the external power connector.