Help in securing wireless connection

Like to know if there is a way to have a laptop that is using a wireless router (C857w) to only use / login to that router. The router is a Cisco 857W and the laptop is a IBM Thinkpad w/WXPSP2. What happens is when the user turns on his laptop he is connected to his neighbors router which is unsecured (great is you are a cheat and what to d/l movies) but this isn't the situation. While in the office there appears to be other offices in the building that is using wrieless and he connects to those as well (we were testing to see if he can connect to his router from the office). The router is setup with dhcp and while it was at my office it worked ok, since there are no WLAN in my area.

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Jon L. Miller
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