MacBook + D-Link DI-714P+ = no internet?

OK, so. The deal is, I have a D-Link wireless router (DI-714P+, to be exact) here at home (ISP=Comcast). Nine months out of the year, I don't have to connect to it because I'm at school (and my family uses the router here), and I've yet to see a wireless router with 1100 miles range. I know the DI-714P+ has been discontinued, but until it dies, I have no option but to work with it.
Anyway. I have a MacBook myself, and the other two comps on the network run WinXP Home. When I try to connect to the router on my MacBook, my computer will register the existence of the network (I'm just going to call the SSID "example" here, though it isn't really that). It will say it's connected to example, but the router doesn't acknowledge my computer's existence. I can't even access the router's IP through my MacBook; if I try, it tells me that I'm not connected to the Internet. I've run through all the troubleshooting suggestions I've been able to find on my Mac's help files, as well as the router's, to no avail. I've changed the SSID in case there was a duplicate (it used to be something common enough that there just might have been interference). The network itself is unsecured because I haven't been able to convince the person in charge while I'm gone that security is important.
I can connect to the Internet through the router if I connect the MacBook to it. Both other computers (a desktop and a laptop, both running WinXP Pro) connect wirelessly just fine.
I've disabled the McAfee SecurityCenter firewall (as provided by Comcast) in hopes that that would help. No dice.
I've found another discussion(here) regarding this exact problem, and no answers.
When I go into Terminal and input "ifconfig en1", I get
en1:flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::217:f2ff:fe49:ebc0%en1 prefixlen 64 scopeid 0x5
inet 192.168.0.175 netmask 0xffffff00 broadcast 192.168.0.255
ether 00:17:f2:49:eb:c0
media: autoselect status: active
supported media: autoselect
Pinging the router itself yields 100% packet loss, and the error "ping: sendto: Host is down" with the occasional "ping: sendto: No route to host" interspersed until I cancel the operation.
Does anybody know if there's something I haven't tried?
MacBook Mac OS X (10.4.9)
MacBook Mac OS X (10.4.9)

On the 17", try making a while new Location for the network, checking for accuracy each step.
If cabled access is OK, but Wireless access is not OK, then it's the Built-In Airport Location settings that you should check (using encryption? are the keys being entered properly?)
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