I'm unable to install Windows 8.1 x64 with the following steps on a qemu virtual machine:
qemu-img create -f qcow2 Windows8.img 20G qemu-system-x86_64 -machine pc,accel=kvm:tcg -cpu host -m 2048 -smp 2 -drive file=Windows8.img,if=virtio -drive file=virtio-win-0.1-74.iso,media=cdrom -cdrom win81.iso -boot d
Windows complains that it cannot find a driver (which is normal as far as I've read install guides). I point the installer to the virtio driver on the second ISO which it seems to recognize and tries to install it. The installation of the driver fails however with this message:
"No new device drivers were found. Make sure the installation media contains the correct drivers, and then click OK."
I'm using qemu 1.6.1 on Gentoo Linux (which is most likely irrelevant).