If you’re running Node on Windows (who isn’t? [don’t answer that]), updating Node.js & NPM to the latest version is a little different than on Linux or OSX. In some ways, it’s easier than you might think.
To update these, the easiest way I have found is to download the latest version of Node.js (NPM is included) from the Node site here. Choose 32bit or 64bit (depending on your setup) and install.
Now if you run “node -v” or “npm -v” you’ll see you have the latest and greatest.