title: SQL Server Express 2008 Install Side-by-side w/ SQL 2005 Express Fails
body: <p>When I try to install a new instance of SQL Server 2008 Express on a development machine with SQL 2005 Express already up and running, the install validation fails because the "SQL 2005 Express tools" are installed and I'm told to remove them.</p>
  
  <p><strong>What exactly does that mean?</strong>  </p>
  
  <p>After reading this article:</p>
  
  <p><a href="http://www.asql.biz/Articoli/SQLX08/Art1_5.aspx" rel="noreferrer">http://www.asql.biz/Articoli/SQLX08/Art1_5.aspx</a> </p>
  
  <p>I uninstalled the 2005 version of the SQL Management Studio but received the same error from the 2008 installer during my follow-up attempt.</p>
  
  <p><strong>Updates</strong></p>
  
  <p>1) Uninstalled the SQL 2005 Management Studio only.  Received the same error from the 2008 install.</p>
  
  <p>2) Removed all SQL 2005 common components.  Received the same error from the 2008 install.</p>
  
  <p>3) Installed the shared components from the SQL 2008 installation program.  Received the same error from the 2008 install when trying to install the new SQL 2008 instance.</p>
  
  <p>4) Uninstalled SQL 2008 components, rebooted, re-installed SQL 2005 Management Studio from installation media, rebooted, un-installed SQL 2005 Workstation Components from Control Panel, re-booted.</p>
  
  <p>Installation of SQL 2008 is now proceeding as it should.</p>
  
  <p>Seems likely that if I'd re-booted after update 2 above things would have gone more smoothly.  :-(</p>