Boot native Windows7 install in KVM

I have native installed and working Windows7.

When I try to boot it as

sudo kvm -hda /dev/sda

it shows BSOD 0x0000007B even if I try to Safe Boot mode.

Same problem using

kvm -drive file=/dev/sda,index=0,media=disk,if=ide 
kvm -drive file=/dev/sda,index=0,media=disk,if=virtio 

(virtio driver are installed in win7)

WindowsXP was working using this schema. What's wrong? What can be made to have it working as bare boot, as KVM boot?

your windows lacks the ide and virtio drivers, and fails to boot. try to start it up, add the required drivers, and then run it under kvm