title: HTTP Error 503 on IIS 7.5 after SP Install
body: <p>I have Windows 7 professional 32-bit with IIS 7.5 installed and configured. I installed the SP1 for Win 7 and since then the IIS is no more working. Even for simple queries like localhost/a.htm (where a.htm is a html file inside under c:\inetpub\wwwroot) leads me to the error:</p>
  
  <pre><code>HTTP Error 503. The service is unavailable.
  </code></pre>
  
  <p>The IIS worked fine up to SP1 (I have a lot of ASP.NET2/.NET 4 applications on it). I uninstalled the SP1, the same happens. What should I do?</p>
  
  <p>Thanks.</p>