“ No Network adaptors” when installing ESXi 5.1

Hi i am new to VMware world. I have trying to install ESXi 5.1 on Dell Optiplex 7010 with 16 RAM for test and learning purpose. When i am trying install ESXi 5.1 it come with an error  that “ No Network adaptors” 

And than the only possibility is “Reboot”

I have have no idea what to do from here.I’ll appreciate you help.

Regards

Rashid