title: Unable to upgrade pip using pip install --upgrade pip
body: <p>I wanted to upgrade pip for installing libraries to learn machine learning. But i am unable to do so.</p>
  <pre><code>C:\Users\adith&gt;pip install --upgrade pip
  Collecting pip
    Downloading pip-21.0.1-py3-none-any.whl (1.5 MB)
       |████████████████████████████████| 1.5 MB 211 kB/s
  Installing collected packages: pip
    Attempting uninstall: pip
      Found existing installation: pip 20.2.3
      Uninstalling pip-20.2.3:
        Successfully uninstalled pip-20.2.3
  ERROR: Could not install packages due to an EnvironmentError: [WinError 5] Access is denied: 'C:\\Users\\adith\\AppData\\Local\\Temp\\pip-uninstall-40mydp3z\\pip.exe'
  Consider using the `--user` option or check the permissions.
  </code></pre>
  <p>I am getting the above error. Any help would be very much appreciated. Thanks!</p>