www.overclockers.co.uk
check out there full systems some nice little net plodders there which will do the job nicely.
As for your child I recommend perhaps using a seperate pc, and running some external application, so you can see what they are upto from your pc and remotely disable or messaget the person.
I know of some good programs once of which a friend from another forum is using
The program is called Netop and should appear on a google the Ultra version is worth the time finding it.
Certainly suprises two young uns at my mates house when they think they care getting away with viewing ...
sites.