I can't tell if you want this person to stop visiting porn sites or not: if you don't want porn sites visited from your PC, create user accounts for each person who uses it, and require passwords to logon - don't leave an account open without a password requirement. If this is your PC, you control who logs on: if its a common PC intended for random logons, set some new rules for use. Either you want the porn visits or not, just decide. fwiw if you don't object to the visits, I think a $79 netbook or a $249 desktop for your little diddler would go a long way towards addressing this issue: let the person mess up their own PC, not one used by others.