My son needs the net in his room for school work, but he keeps going onto msn and I obviously can't supervise him 24/7. He is good with computers and can get around any simple measures like just uninstalling it. Can zonealarm be configured to block him from going on msn? It would need to be something he can't easily change, either- perhaps putting a password on zonealarm could help me with that?
Any help would be most appreciated.

Operating System:Windows XP Pro
Software Version:7.0
Product Name:ZoneAlarm Internet Security Suite