I agree with Thomas, 1 MB for a Windows CDROM looks weird.
Anyway, though it was posted some months ago maybe the info provided in this discussion: How to create Windows VM? can help you to prepare your windows VM, try to read it as it has lots of info. For example you’ll need some drivers if you want to use Virtio devices like disks, network interfaces… if you use KVM, it’s always a good idea to use Virtio for enhanced performance.
Cheers