simulate ISE and ACS with Virtual box

[timben]

I followed the process described in ( type install-gns12-and-asa842-by-poxximus in google ) and it works fine but not for virtual box to simulate an ACS and ISE.
Actually, i didn't find an ISO dedicated for Virtual Box as described in the tuto
ACS_v5.5.0.46_VBOX.iso and ise-1.2.1.198.x86_64_VBOX.iso.
Therefore i downloaded iso with same name without VBOX and i had the two following issue :
For ACS :
i used the following file ACS_v5.5.0.46.iso, i had the message :
error : unsuported hardware configuration this software can only be installed on cisco

For ISE :
I used the following file :ise-1.2.1.198.x86_64.iso, i had the message :
Please use a 32 bits formats as it's not supported

So my question is :
Where can i download the good ISO for virtual box running on a windows 7 64 bits. A little precision, windows 7 is emulated through vmware fusion running on a mac.

[Perryg]

Nested virtualization is not supported.