title: How to find out from the Windows registry where IE is installed?
body: <p>I can find out where Firefox is installed as follows; query this key to get the current version:</p>
  
  <pre><code>HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\Mozilla Firefox
      CurrentVersion
  </code></pre>
  
  <p>... then query this key to get the installed path (where "nnn" is the version number obtained above):</p>
  
  <pre><code>HKEY_LOCAL_MACHINE\SOFTWARE\Mozilla\Mozilla Firefox\nnn\Main
      Install Directory
  </code></pre>
  
  <p>But I can't work out how to find where IE is installed. What key or keys will work on Windows XP, Windows Server 2003, and later?</p>