Why won’t my Compaq laptop connect to my wireless router?

It has connected fine to the router at my father’s house and connected to the router at a friend’s house. However, at my mother’s house, my new Compaq laptop (with Windows Vista) will not connect to the Belkin N Wireless Router. I have gone through the troubleshooting steps, have made it through the security, and have plugged it in (successfully) with an ethernet cable, but my laptop is unable to connect to the internet.
Can anyone help me?

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