title: createuser command for postgres failing on windows
body: <p>I installed postgresql on Windows.  When I run createuser in the DOS prompt, it fails with the following error:</p>
  
  <pre><code>createuser testuser
  
  could not connect to database postgres : FTAL: role testuser does not exist 
  </code></pre>
  
  <p>I have tried switching the pg_hba file from md5 to trust, but that has not solved the issue.  Any thoughts?  The database server itself is running- I was able to connect to it using another tool. Also, the path has a reference to the postgres/bin directory.</p>