title: pip install - PermissionError: [Errno 13] Permission denied
body: <h1>Environment</h1>
  
  <ul>
  <li>Windows 8.1</li>
  <li>Python 3.5</li>
  <li>Anaconda</li>
  </ul>
  
  <h1>Issue</h1>
  
  <p>When I do <code>pip install sklearn --upgrade</code>, I got the following error:</p>
  
  <pre><code>Exception:
  Traceback (most recent call last):
    File "d:\anaconda3\lib\site-packages\pip\basecommand.py", line 209, in main
      status = self.run(options, args)
    File "d:\anaconda3\lib\site-packages\pip\commands\install.py", line 317, in run
      prefix=options.prefix_path,
    File "d:\anaconda3\lib\site-packages\pip\req\req_set.py", line 732, in install
      **kwargs
    File "d:\anaconda3\lib\site-packages\pip\req\req_install.py", line 835, in install
      self.move_wheel_files(self.source_dir, root=root, prefix=prefix)
    File "d:\anaconda3\lib\site-packages\pip\req\req_install.py", line 1030, in move_wheel_files
      isolated=self.isolated,
    File "d:\anaconda3\lib\site-packages\pip\wheel.py", line 344, in move_wheel_files
      clobber(source, lib_dir, True)
    File "d:\anaconda3\lib\site-packages\pip\wheel.py", line 322, in clobber
      shutil.copyfile(srcfile, destfile)
    File "d:\anaconda3\lib\shutil.py", line 115, in copyfile
      with open(dst, 'wb') as fdst:
  PermissionError: [Errno 13] Permission denied: 'd:\\anaconda3\\Lib\\site-packages\\sklearn\\utils\\m
  urmurhash.cp35-win_amd64.pyd'
  </code></pre>
  
  <p>The command prompt is run as an Administrator, so I have the permission.</p>
  
  <p>What should I do? Any suggestion would be appreciated. </p>