We do not yet have a fully documented example of how to create a Microsoft Windows image. You can use libvirt to install Windows from an installation DVD using the same approach as with the CentOS and Ubuntu examples. Once the initial install is done, you will need to perform some Windows-specific customizations.
Installing the VirtIO paravirtualizaion drivers for Windows will improve virtual machine performance when using KVM as the hypervisor to run Windows.
Microsoft has a special tool called Sysprep that must be run inside of a Windows guest to prepare it for use as a virtual machine image. On Windows 2012 server, invoke sysprep, as follows:
c:\windows\system32\sysprep\sysprep.exe
cloudbase-init is a Windows port of cloud-init that should be installed inside of the guest. The source code is available on github.
Jordan Rinke maintains a collection of resources for managing OpenStack Windows virtual machine guests.
