I seem to be getting the following when I execute npm install bower -g
npm install bower -g
/usr/local/share/npm/bin/bower -> /usr/local/share/npm/lib/node_module
If all of the above doesn't work, or you don't seem to understand the answers provided to the question.
I suggest you run the installation commands on your system command prompt and not git-bash, especially if your are on windows 8 or 7.