If you're looking to download a Windows 7 image in qcow2 format, here are some general steps:
: Sites like Cloudbase-Init have historically provided Windows cloud images specifically optimized for OpenStack and VirtIO drivers. How to Create Your Own
Before we discuss the download, let's address the "why."
: Some developers share scripts and pre-built images for virtualization. Look for projects like Windows-KVM imaging tools . How to Create Your Own .qcow2 Image
The Quest for the Windows 7 .qcow2 Image: Retro Computing in a Modern Box