Net usage application

[Myth]

Evening,

Looking for a net usage app for a Windows XP comp

Client's son clicked on a link while playing Runescape and now they seem to have burned off 3GB within 24 hours; which is highly excessive for client and her kids.

I would just like an application that shows how much is going out by whatever app/process via the network card; and if possible, where to.
I am thinking that some little program was downloaded and essentially the computer is now a drone.

Also; anyone know of any laws (esp U.S.) that may have been contravened by these so-called "mates" on Runescape? Might get the lil buggers

[fred_fish]

Netmeter
http://www.metal-machine.de/readerror/
Is a basic traffic meter.

Netstat will show connection endpoints, or cports &/or smartsniff from nirsoft.

[Snorkbox]

Or TUC