Recently I had and issue with browser-sync on Windows. The problem came from node-gyp, a cross platform compiler that is integrated in Node.js. Exactly this module of Node.js was throwing an error that stated ‘Python is missing’ on Windows.
Actually the thing is a little bit more tricky and over the last couple of days I read many problems with node-gyp and Windows. Some mentioned to install Visual Studio Community Edition as well as other components found on the Microsoft Web Site.
The only thing Windows needs is just some Vitamin C in the form of a Visual C++.