Mac Wireless (http://www.macwireless.com/html/support/airport_radar/index.php?ven=mw&cat=airport_radar&ver=1.1.2b1) will let you see what wireless networks are around you. It's a widget so is quite handy wherever you go.
Can you check the settings on the Modem? I'm assuming there's a router in there with it. You'll need to check whether anyone else is connecting and that would mean looking at the interface to the modem. You'd probably be connecting via DHCP (acronym for thing what lets computers connect and get an IP address). You can check your IP (under network in the system prefs) against what's in the modem. Make sure there is only one IP address assigned by the modem and that it matches yours.
There's a lot of stuff to cover. If you still need help with it, get the modem model number (will be on the modem somewhere) and we can work from there.
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Can you check the settings on the Modem? I'm assuming there's a router in there with it. You'll need to check whether anyone else is connecting and that would mean looking at the interface to the modem. You'd probably be connecting via DHCP (acronym for thing what lets computers connect and get an IP address). You can check your IP (under network in the system prefs) against what's in the modem. Make sure there is only one IP address assigned by the modem and that it matches yours.
There's a lot of stuff to cover. If you still need help with it, get the modem model number (will be on the modem somewhere) and we can work from there.