title: npm version shows Error: Cannot find module 'readable-stream'
body: <p>I have installed node js on my windows 7 machine, and the version is being shown as v4.1.2 but when I am trying to run npm install or even check npm version it throwing the following error. Can any one help me where is the problem?</p>
  
  <pre><code>C:\Users\nmadasu&gt;npm version
  module.js:338
      throw err;
      ^
  
  Error: Cannot find module 'readable-stream'
      at Function.Module._resolveFilename (module.js:336:15)
      at Function.Module._load (module.js:286:25)
      at Module.require (module.js:365:17)
      at require (module.js:384:17)
      at Object.&lt;anonymous&gt; (C:\Users\nmadasu\AppData\Roaming\npm\node_modules\npm
  \node_modules\are-we-there-yet\index.js:2:14)
      at Module._compile (module.js:434:26)
      at Object.Module._extensions..js (module.js:452:10)
      at Module.load (module.js:355:32)
      at Function.Module._load (module.js:310:12)
      at Module.require (module.js:365:17)
  </code></pre>
  
  <p>After reading SO (<a href="https://stackoverflow.com/questions/24010598/node-js-cannot-find-module-readable-stream">Node.js cannot find module &#39;readable-stream&#39;</a>) solutions, I tried <code>npm install gulp -g</code>, even this also giving same error.</p>
  
  <pre><code>C:\Users\nmadasu&gt;npm install gulp -g
  module.js:338
      throw err;
      ^
  
  Error: Cannot find module 'readable-stream'
      at Function.Module._resolveFilename (module.js:336:15)
      at Function.Module._load (module.js:286:25)
      at Module.require (module.js:365:17)
      at require (module.js:384:17)
      at Object.&lt;anonymous&gt; (C:\Users\nmadasu\AppData\Roaming\npm\node_modules\npm
  \node_modules\are-we-there-yet\index.js:2:14)
      at Module._compile (module.js:434:26)
      at Object.Module._extensions..js (module.js:452:10)
      at Module.load (module.js:355:32)
      at Function.Module._load (module.js:310:12)
      at Module.require (module.js:365:17)
  </code></pre>