qemu-system-x86_64 -hda windows7.qcow2 -cdrom path/to/windows7.iso -m 2048 -vnc :0
If you have a VMDK or RAW disk:
Running Windows 7 in a .qcow2 format in 2021 and beyond is feasible with QEMU. While Windows 7 is no longer supported by Microsoft, virtualization allows for continued use in a sandboxed environment, which can be beneficial for legacy application support. Always ensure you have the necessary licenses for any operating system you use. windows 7qcow2 2021
Running Windows 7 after 2021 on a network is risky. Mitigations: qemu-system-x86_64 -hda windows7