http://blogs.technet.com/b/rob/archive/2010/05/31/sql-server-wow64-perfmon-issues.aspxI recently came across some issues running perfmon on Windows Server 2003 where the OS is 64-bit and SQL Server is 32-bit (Wow64). The SQL Performance counters were not appearing as the default Perfmon is 64-bit, which is unable to read the 32-bit SQLen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.technet.com/b/rob/archive/2010/05/31/sql-server-wow64-perfmon-issues.aspx#3359002Thu, 30 Sep 2010 17:02:07 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3359002otto<p>This doesn&#39;t apply to WIndows 2008 R2. Just ensure the Performance Counter DLL Host service is started.</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3359002" width="1" height="1">