If it is a normal PC installation Exsi, will report the error
No network adapters were detected. Either no network adapters is physically connected to the system, or a suitable driver could is not being located. A third party driver could be required.
Ensure that there are at least one network adapter physically connected to the system before attempting installation. If the problem persists, consult the VMware knowledge Base
Due to the lack of drivers.
The first thing to do is to find your machine's NIC driver model, and then on VMware to find the appropriate driver (suffix VBS file), my is Reltek LAN
Http://blog.bossma.cn/wp-content/uploads/2014/09/VMware_bootbank_net-r8168_8.013.00-3vmw.510.0.0.799733.zip
Then use the Esxi-customizer tool to add the driver to the ISO and regenerate the new ISO.
Http://www.v-front.de/p/esxi-customizer.html
And then you can install it.
ESXi 5.5 Add Driver