I am starting out angular app with angular-fullstack in my Windows 7 box. I installed bunch of npm packages with -g options, including grunt-bower-install. I created the app
I faced the same problem but only did npm install -g bower and then bower install and got grunt serve working.
npm install -g bower
bower install
grunt serve
I did not need to do any of the things mentioned by Olga.
Hope this helps.