Just uninstall the drivers from Uninstall or change a program, assuming you are using Windows 7, click my computer, then Uninstall or change a program and select the AMD drivers, CCC etc for your graphics card. You can even download a program called Driver Sweeper which is free to remove all traces.
Install your 570 and download the latest driver from Nvidia, during instalation , click the checkbox that says clean install. After its done, reboot and you will be up and running.
Then open the Nvidia control panel and adjust the setting for the 570 to your liking.