title: Cannot find module 'semver' When installing Npm
body: <p>This is the error i got when try to install npm. 
  please help me to fix it.</p>
  
  <pre><code>module.js:549
      throw err;
      ^
  
  Error: Cannot find module 'semver'
      at Function.Module._resolveFilename (module.js:547:15)
      at Function.Module._load (module.js:474:25)
      at Module.require (module.js:596:17)
      at require (internal/module.js:11:18)
      at Object.&lt;anonymous&gt; (C:\Users\maheshig\AppData\Roaming\npm\node_modules\npm\lib\utils\unsupported.js:2:14)
      at Module._compile (module.js:652:30)
      at Object.Module._extensions..js (module.js:663:10)
      at Module.load (module.js:565:32)
      at tryModuleLoad (module.js:505:12)
      at Function.Module._load (module.js:497:3)
  </code></pre>