title: npm error on every command: EEXIST: file already exists, mkdir 'c:\users\user\appdata\Roaming\npm'
body: <p>I'm just new to node and npm and this is frustrating.</p>
  
  <p>Well it's almost all said in the title.
  On a Windows 10 x64 using a NON elevated prompt, all npm commands shows:</p>
  
  <pre><code>EEXIST: file already exists, mkdir 'c:\Users\Josep\AppData\Roaming\npm'
  at Error (native)
  </code></pre>
  
  <p>Even npm -v shows it twice before the version number.</p>
  
  <p>Not hapening in an elevated prompt. version numbers differ in an elevated and a user prompt.</p>
  
  <p>Double checked PATH variable. Same on two cmd windows.</p>
  
  <p>Node version 6.10.0</p>
  
  <p>NPM Versions: 4.3.0 at elevated prompt and 3.10.10 at a user prompt.</p>