cuda tool kit installation failed

on running .run command for installation of tool kit its showing driver installation failed
cuda tool set installation skipped
cuda sample installtion skipped
althuogh i have NVIDIA GTX 670 ti boost drivers already installed for my ubuntu 12.4 system with nvidia drivers

Can you please attach the /var/log/nvidia-installer.log file? This should give us an idea of what’s going wrong with the driver installation.