virtualbox.org

Hello, guys.
I have windows7 on esxi 5.5
And on that windows 7 i want to run virtualbox with windows7 inside.
But Im getting this error: VT -x is not availabe (VERR_VMX_NO_VMX)
Error code 0x80004005

That's because ESXI is not passing VT-x to VirtualBox. You would have to ask the VMWare folks why not.

Thanks for answer.
And could u tell how to configure esxi to pass VT-x?
Or where to have a look?

If you have questions about VMWare configuration then you need to ask them on a VMWare forum.