title: Message while installing chocolatey
body: <p>i am installing Chocolatey on my computer by using powershell,but when i type this command on powershell as an admin:</p>
  <pre><code>Set-ExecutionPolicy Bypass -Scope Process -Force; iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))
  </code></pre>
  <p>I get this message:</p>
  <pre><code>An existing Chocolatey installation was detected. Installation will not continue.
  For security reasons, this script will not overwrite existing installations.
  
  Please use choco upgrade chocolatey to handle upgrades of Chocolatey itself.
  </code></pre>
  <p>I don't understand why it said there is an existing chocolatey installation,how should i fix it and keep installing chocolatey on my computer?</p>