title: Why is 'ruby' not recognized as an internal or external command?
body: <p>Path in user variable is the default path from the installation:</p>
  
  <pre><code>C:\RailsInstaller\Git\cmd;C:\RailsInstaller\Ruby1.9.3\bin
  </code></pre>
  
  <p>Path in system variable is directed to:</p>
  
  <pre><code>C:\RailsInstaller\Ruby1.9.3\bin
  </code></pre>
  
  <p>When I open the Command Prompt with Ruby and Rails, the command prompt says "'ruby' is not recognized as an internal or external command" immediately without any input.</p>
  
  <p>The command prompt worked before. After I re-installed it using various methods due to unsuccessful setup, it got like this.</p>
  
  <p>How can I fix it?</p>