If your router can block IP address's then stopping these should stop MSN
207.46.0.45
65.54.157.111
213.253.9.72
146.101.162.215
207.68.178.61
207.46.0.145
213.254.245.30
213.200.97.62
213.254.245.30
213.200.100.30
Are you talking about Windows Messenger or MSN messenger?
Both are very difficult to stop as they use a selection of ports and can use port 80 as well. The best way is to uninstall it as stduc says of use a third party app like App Killer (It's free).
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