I would remove your drivers for your old card then power down the system and install your new one. Then just jump on the Nvidia website and install the latest ones for your new card.
You could get a way without doing it, but a clean install every now and then isn't a bad thing even if you're not changing the GPU; I'd recommend a full re-install of the drivers.
I would remove your drivers for your old card then power down the system and install your new one. Then just jump on the Nvidia website and install the latest ones for your new card.