May I make an alternative suggestion. Since children - especially unattended - find out in quick order much more about computers than a lot of adults know, rather than trying to stop that learning process, just take reasonable precautions, like routinely backing up your files. In the case of VV, those are the *.ldw files in the games folder. That way you get the best of both worlds: the villagers and your other work will be safe, and the child's learning curve isn't stymied.
