Kali is system operatiosn based on Linux Kernel. Before there are using Backtrack name’s. Kali linux usually used for penetration and testing about security of website/networking.
Security Job Division maybe need this for testing their programs in their Company to certain the System is not weak for accessed by irresponsible people, like Hackers or Crackers.
In here we provide Kali Linux in .VHD format, that you can plant in Virtual Box Operating System, you can just insert as disk image, then you can Go kali Linux in Your Windows Hosts without need to using dualboot, clear and of course more safety.
Update with new .VHD