You clearly installed the wrong ESXi, on your screenshot we can seen product : VMware vSphere 5 Hypervisor, it should be VMware vSphere 5 [Version Licensied].
VMware vSphere 5 Hypervisor means you have downloaded the ESXi Hypervisor free. This hypervisor couldn't be add to a vCenteR.
As you can see on my screenshot.
Sorry , but you need to download the good iso available here and re-install your host. Link to download here :VMware vSphere 5: Private Cloud Computing, Server and Data Center Virtualization
After you will able to add it on your vCenter.
Regards,
Julien.