Downloded the latest nVidia drivers that were released today (332.21), and Cudaminer wont work now ("Unable to query CUDA driver version! Is an nVidia driver installed?"). Never had this problem before when updating drivers, so sorry if I've missed over the answer somewhere in here!
No problem on my computer.
I've just updated the driver too.
I should have known this, and shouldn't have even posted without doing this first, but a computer restart fixed it, and it's mining away now.