That's what I've always thought, haven't tried it with my parents. Idea is, set up a vm, snap shot it, have their save folder somewhere outside of the VM, and then if they manage to mess up the VM, just restore the snapshot.

Honestly, it is when I am trying to teach my parents how to use computers do I realize how annoying computers are. I mean, some of the simplest things we take for granted are pretty dumb if you have to explain it to someone.