PHP LDAP Extension not installed

I have wordpress hosted on IIS on a Windows Server 2008R2 SP1 box. After enabling the plugin, I received the PHP LDAP extension is not installed warning so I followed the directions and enabled the extension, checked that both libeay32.dll, and ssleay32.dll were in the root php install directory. I rebooted the server and verrified that the correct version of php was being used in phpMananger and that the ldap extension was enabled. I’m still getting the PHP LDAP extension is not installed or disabled warning. Any ideas what could be wrong?