Ok in short yes there are better drivers.
But i have to say, That IF you have the 3.7 driver, your golden. If not you can get them at ATI under archived drivers. The 3.10 drivers are the newest if you want them.
As for your old drivers. Yes they probably will interfear with your ATI card. First uninstall your NV drivers in add and remove programs. Then find a program called Driver cleaner. I think you can get it at guru3d or whatever that site is. Run that after you uninstall the NV drivers. Then your going to want to get rid of your ATI driver. Do the same process. Then go into your HD and remove the ATI folder and ANY NV folders and reboot.
Do a defrag, THEN install your ATI driver again. This should do very well and eliminate any problems that might show up.
Good luck.
Harry