This ensures no pre-existing malware and full control over drivers.
qemu-system-x86_64 \ -m 4096 \ -smp 2 \ -enable-kvm \ -cdrom /path/to/Win7_SP1.iso \ -drive file=windows7-disk.qcow2,format=qcow2 \ -boot d windows 7 qcow2 image install download
The most reliable method is to create your own QCOW2 image using a Windows 7 ISO file. This ensures no pre-existing malware and full control