vCenter Simple Install 5.1 continues to fail

vCenter Simple Install 5.1 continues to fail with error 29114. I choose the SQL 2008 Express installation, because it's already installed for another app.

I've looked at this help, but did not work.

VMware KB: Installing vCenter Single Sign On in an IPv6 environment fails with the error: Error 29114.Cannot connect…

Any help would be greatly appreciated.