Installing OS on ESXi5.5 that is in VirtualBox

[Kloony]

Hello, and sorry for newbee's questions and explanations, for I am very beginner, plus i am not a native english-speaker
Desctiption:
I have a VirtualBox 4.3.6 on Windows 8.
Created two virtual machines and install OSes on them (Windows 7 and ESXi5.5).
The next step must be installing Centos 6.5 64 on ESXi5.5 from VMWare vSphere Client that is on guest W7.
I was trying to install it from an ISO that i put firstly in "C:\" of W7, and secondly load as a CD from VirtualBox. The result in both cases is hanging on the string "Probing EDD (edd=off to disable) ....", after wich window closes, ISO unmounts.
There are some unclear solution of such a thing, but i found none about installation Centos on ESXi inside VirtualBox.
If you need some deeper info, please tell me what is needed.
Thank you very much!!!

[Perryg]

While it may be possible it is not supported to run nested virtualization.

[Kloony]

That is sad.. But thanx a lot for reply!