The issue is caused by Windows Device Guard blocking virtualbox. So unless you can convince IT to disable Device Guard, this effectively shuts down this method of trialling Dataiku.
Hardware virtualization is needed for Dataiku DSS to work in a virtual machine. You should find some troubleshooting help on: https://doc.dataiku.com/dss/latest/installation/other/vm.html#hardware-virtualization
Has IT uninstalled hyper V and then restarted your computer? The link referenced in our documentation (http://druss.co/2015/06/fix-vt-x-is-not-available-verr_vmx_no_vmx-in-virtualbox/) corresponds to the same error you posted.
The issue is caused by Windows Device Guard blocking virtualbox. So unless you can convince IT to disable Device Guard, this effectively shuts down this method of trialling Dataiku.