When I upgrade to whatever flavor of ATI is fastest on my next upgrade cycle, I am going to do the following:
1. Unintall the nV drivers through Control Panel.
2. Reboot into safe mode.
3. Remove the nV card from the device manager.
4. Unplug broadband connection.
5. Run cab cleaner (part of driver cleaner)
6. Run
driver cleaner.
7. Empty recycle bin.
8. Shut computer off.
9. Remove old card and install new.
10. Install CAT 3.7 or Omega 3.6 - having downloaded these previously.
11. Reboot.
12. Plug broadband connection back in.
You can do the control panel only method and that works fine for some, but if you have trouble this is a little extra insurance.