Thank you so much for the quick reply. What details should I provide? Is there a command I can run in ESXi that would give more information?
I am trying to follow this tutorial http://www.virtualizationadmin.com/articles-tutorials/vmware-esx-and-vsphere-articles/installation-and-deployment/getting-starting-vsphere-5-vcenter-server-appliance.html
I downloaded and installed ESXi to my laptop, and installed it in VMware workstation, then I used my browser to get vSphere client from ESXi. I installed it on my laptop, and now I am trying to install the vSphere 5 vCenter server according to the procedure in the above url.