How to Boot another windows inside windows?

"In your favourite virtualisation tool, you should be able to add your physical disk as a drive in your VM. Once you do this, you then should be able to change the boot order in the VM BIOS to boot from the existing Windows install.

However, Windows may not like if that much seeing you are changing the hardware of the operating system. Virtualisation programs create their own set of 'hardware', so it would appear as if you took the hard drive out of one computer, and put it into another. You may have to activate the installation of Windows again."