Just finished setting up a new machine for an older relative that boots instantly into linux, starts qemu with a copy-on-write version of Windows 7. It doesn't

Just finished setting up a new machine for an older relative that boots instantly into linux, starts qemu with a copy-on-write version of Windows 7. It doesn't need updates because they don't access the internet, good luck virus writers when it gets nuked from outside the VM every time it reboots!