title: Error: EINVAL: invalid argument, mkdir 'C:\Users\user\'C:\Users\User\AppData\Roaming\npm
body: <p>I've just installed nodejs then just to confirm its availability running node -v shows the version of node installed but on running npm -v it  displays</p>
  <pre><code>Error: EINVAL: invalid argument, mkdir 'C:\Users\user\'C:\Users\User\AppData\Roaming\npm'
  </code></pre>
  <p>tried to find the .npmrc to change the</p>
  <pre><code>prefix=&quot;D:\\node\\node_global&quot;
  </code></pre>
  <p>I also can't find it.</p>