title: SQL SP4 installed but not showing @@version
body: <p>I am trying to install <code>SQL Server 2005 SP4</code> on <code>windows 2008 R2 SP1</code>. Right now I have <code>SQL Server 2005 x64 Standard Edition SP1</code>. I did try to install the <code>SP 4</code> couple of times but whenever I checked the <code>@@version</code> it’s still showing me <code>SP1</code>. 
  I download this version of <code>Microsoft SQL Server 2005 Service Pack 4 RTM</code> and trying to install with no luck.
  I check the hotfix summary and its shows me below results:</p>
  
  <pre><code>******************
  Prerequisites Check &amp; Status
  SQLSupport: Passed
  *******************
  Products Disqualified &amp; Reason
  Product                                   Reason
  *******************
  </code></pre>
  
  <p>Your help is greatly appreciated. Thanks</p>