For those of you who are having trouble running npm install on a fresh laravel install (or perhaps for laravel-elixir in general), install Visual Studio 2013 Express for Windows Desktop. It supports C99 which solves the "no stdbool.h found" errors when node-gyp tries to build libsass.
Also, my reason for creating this thread even though another similar discussion on Elixir + Windows has already been started, it seems to be throwing errors. Whoops!
Anywho, just wanted to make sure you guys don't have the issues I do.