block messenger completely

A friend has a teenage daughter who has become practically addicted to
messenger - this is causing major family problems.

What is the easiest way to stop her using messenger completely and making
sure it cannot be simply reinstalled. They use Norton Internet Security if
there is a way this can block all messenger comms.

Thanks for any help,
g.

"Fat Freddy's Cat" skrev i en meddelelse
...
A friend has a teenage daughter who has become practically addicted to
messenger - this is causing major family problems.

What is the easiest way to stop her using messenger completely and making
sure it cannot be simply reinstalled. They use Norton Internet Security
if there is a way this can block all messenger comms.

Block the ports it use to connect to the login-servers in their
router/firewall administratively.

--
Gio