When installing Server 2008 on Qemu, for the creation of an OpenStack Windows Server 2008 template; I found it easiest to use virt-install.

Below is the code that I use to kick off that virt-install.

virt-install --virt-type kvm --name win2008 --ram 2048 --cdrom=/path/to/cd-iso/server-2008.iso --disk path=/path/to/disk/file/location/2008.qcow2 --network network=default,model=virtio --graphics vnc,listen=0.0.0.0 --noautoconsole --os-type=windows --os-variant=win2k8