I looked into our licensing and it turns out we had purchased VirtualCenter Server along with our ESX servers.
I set off to configure it by loading a Windows 2003 R2 server with SQL 2005. I then proceeded to install the management software.
You need to download the software from VMware and your licensing file.
After installing VirtualCenter, I attempted to add my ESX standalone host to the management server. I then got this error "There are not enough licenses installed to perform the operation".
I did some research and found out I needed to load my license file for my ESX servers in the VirtualCenter. http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1005265
So, I loaded the licenses off my ESX server onto the Virtual Center, restarted the licensing server, but no dice. Same error "There are not enough licenses installed to perform the operation" occurred.
At this point I contacted VMware support. I got no where after a week, so I started looking at the problem more myself. I noticed license file and notice the site said "Single Host" next to the license model. I removed the active license, and reactivated it as Centralized, loaded it on my VirtualCenter, BOOM, Works!!!
Before: [Single Host License]
After: [Centerlized License]