MacBook can see wireless network, but can't connect; no error message

This one has got me stumped: my father has a new D-Link wireless router. His Windows laptop connects to it just fine, but neither of our Apple laptops (an old PowerBook G4 and a brand new MacBook Pro) will connect to it. The network does appear in the Airport menu, but when I select it, nothing happens. It pauses for a second, and then I'm left disconnected from all wireless networks. No error message, no connection, no check appears next to the network's name. No security of any kind is enabled, and I've turned off "n" support on the router. I'm at a loss, and can't seem to find anyone with similar problems. Any ideas?
The console gives me the following:
2008/12/27 9:42:40 PM kernel AirPort: Link Down on en1
2008/12/27 9:42:40 PM kernel AirPort: Link Down on en1
2008/12/27 9:42:43 PM kernel Auth result for: xx:xx:xx:xx:xx:xx Not Authenticated
2008/12/27 9:42:43 PM airportd[7585] Error: Apple80211Associate() failed -7
2008/12/27 9:42:43 PM airportd[7585] Error: processcommanddict() failed
2008/12/27 9:42:43 PM SystemUIServer[7514] Error: airportd MIG failed = -7 ((null)) (port = 57487)
2008/12/27 9:42:43 PM SystemUIServer[7514] Error: airportd MIG failed = -7 ((null)) (port = 57487)
2008/12/27 9:42:46 PM kernel Auth result for: xx:xx:xx:xx:xx:xx Authenticated
2008/12/27 9:42:46 PM airportd[7585] Error: Apple80211Associate() failed -7
2008/12/27 9:42:46 PM airportd[7585] Error: processcommanddict() failed

I've tried that (every time I've changed the D-link settings, and seperately). No dice,

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