Originally Posted by lord_hammer
ERR: API mismatch: NVIDIA kernel module is version 1.0.7667 but this X module is version 1.0.8178.
Run your 8178 .run file again with the param --uninstall.
When it's done, read /var/log/nvidia-installer.log, it will list a bunch of files that it didn't remove because they weren't part of the 8178 install -- remove them all (carefully, there are similar named files).
Then re-install, this should clear up this particular error.