install driver failed on Mac OS X 10.6.8 and 10.7 both

My macbook is macbook pro 6,2 with NVIDIA GT 330M card. On Mac OS X 10.6.8 and 10.7, CUDA driver is installed respectively on two OS. After installing driver, when i try to find file in /usr/local/cuda, only lib/libcuda.dylib can be found. bin/nvcc or other files can’t found in /usr/local/cuda. After i finish install SDK and toolskit, there is no /bin/nvcc or other files in /usr/local/cuda can be found too.
CUDA driver version on my macbook is 4.0.50. Why driver can’t be installed successfully on my mac book? Can anyone help me? thx