title: Unable to start Windows Firewall or Unable to ping your machine from another one (Some services do not start in Windows Vista or Windows 7)
body: <p>I think I've been affected by a virus which give me a real hard time to repair. I’d like to share with you to save you many hours if you ever have the same problem.</p>
  
  <p><strong>Symptomes:</strong></p>
  
  <ul>
  <li>Access error while trying to start a windows service (Firewall, DHCP, DIagnostics Policy)</li>
  <li>Unable to reach your machine from another one (either ping).</li>
  <li>Unable to start Windows  Firewall. Error code 0x80070005 </li>
  <li>Windows Firewall Snap-in error code: 0x6D9</li>
  <li>Unable to allow “Remote assistance” in Windows Firewall</li>
  <li>Unable to allow “File and Print Sharing” in Windows Firewall</li>
  <li>Event Viewer – System – Error: Windows Firewall service terminated with service specific error Access is denied..</li>
  <li>Trying to start “Windows Firewall” service from the service snap-in give error “Code 5, access error”.</li>
  <li>Trying this would not work: <a href="http://support.microsoft.com/kb/943996" rel="nofollow">http://support.microsoft.com/kb/943996</a> either the Fixit or manually. 0x80070005 (Code 5, access error)</li>
  <li>Unable to add user or permissions for user: MpsSvc</li>
  </ul>