https://superuser.com/questions/662927/is-there-a-way-to-completely-delete-chrome-os-on-a-chromebook-and-install-linu. This posting on superuser.com explains how to totally remove the Chrome OS from the Chromebook and install Linux instead. This is a good option if you want a proper operating system on your Chromebook and not the Google operating system supplied with the netbook. Installing Linux would allow someone to use apt-get to install packages if you installed Debian instead of ChromeOS. One of the commenter’s wiped Chrome OS and installed Arch Linux on his ARM-based Chromebook. The same can be done on Intel CPU based Chromebooks if you know how. There are ARM versions of Linux and these would work on that device. There is an ARM port of Debian, this would suffice on a Chromebook. Link: https://www.debian.org/ports/arm/. A handy little Chromebook running Debian or Arch Linux would be very useful indeed. And this procedure should be quite painless if you follow it attentively. So installing another operating system on a Chromebook is quite possible. I wonder if you could use qemu KVM to run a virtualised operating system on one. I doubt the CPU would natively support virtualisation. Although according to this page it can be enabled on a Chromebook. So KVM is an option for running another OS in a Hypervisor.
I am using qemu KVM on my desktop PC to run Windows 7 Ultimate in a Hypervisor and it is very fast indeed. I even got sound working. Here is the posting explaining how I got this working: http://www.securitronlinux.com/bejiitaswrath/how-to-install-windows-7-in-a-qemu-kvm-virtual-machine-and-enjoy-a-fast-windows-desktop-in-a-window/.
Installing Windows 7 on a Chromebook.