Not sure (I've never tried this), but I doubt that this is possible. The vCenter setup procedure initializes the database, and add content to it, and I don't think that the services will work without this.
In this situation, I'd recommend you reinstall vCenter Server, or - even better - deploy the vCenter Server Virtual Appliance, since VMware plans to drop the Windows based version in a future version anyway. Also remember that version 5.5 will run out of general support in September.
Thank you very much André, much appreciated. I thought as much, i suspected that this might not work since the VC config is largely stored in the database.
Yes, we are busy looking at upgrading all our VMware platforms to vSphere 6.x. Thanks again for advise...