Have you tried disabling that port using the regular windows firewall? Easiest solution since that pc is xp home, is to give your brother guest access and then uninstall Windows messenger and MSN Messenger. (upgrade to SP2 if haven't done so to do what I've mentioned) Remove all shortcuts and...
Do you have the wireless access point connected to the switch using the wan port? Are there any ethernet ports on the wireless access point? Model numbers would help.
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