title: How do I eliminate "The specified service already exists" when I install new versions of my software?
body: <p>I have a VS2008 application that includes a service project (I'll call it ServiceProject).  I have the installation project (InstallationProject) set to RemovePreviousVersions.  Additionally, <strong>I have Custom Actions set</strong> for InstallationProject, to Install, Commit, Rollback, and Uninstall the Primary output from ServiceProject.  </p>
  
  <p>Sometimes when I build new versions of the installer, I can install without an error.  Often, when I get to the point of setting up the service (entering a username and password into the installer) - it fails with the error, <strong>"The specified service already exists"</strong>.  </p>
  
  <p>I don't know why it's inconsistent, though I've considered that maybe there is some kind of signature for the service and if the service is unmodified, it is able to remove it successfully, but with modifications, it doesn't recognize the service.  However, I rarely make modifications to the service, so I doubt that's it.</p>
  
  <p><strong>How can I make my installer successfully update the service without this error?</strong>  My work-around is to manually go into Control Panel, uninstall the former application, then run the installer.</p>