Good job.

I still think you need to make a limited user account for him on your computer - someday he might really mess it up.

Right now you are using your computer in "administrative mode"
meaning anyone can make major changes, there is a guest and limited modes where others will not be able to make changes like this - only the admin account can.

here's some info on user accounts- you might want to consider this -
http://www.worldstart.com/tips/tips.php/2891