Networking – cannot renew ip unable to contact dhcp server

Hey all, I'm trying to switch up a home network from one computer (XP Service Pack 2) directly connected to via a modem to 2 computers (adding a Macbook) connecting through a router. The Macbook is connected wirelessly while the XP computer will (hopefully someday) have a wired connection (dual wireless/wired router).

The problem is that the XP computer won't connect through the router. Keep in mind that it connects just fine when hooked directly to the modem, so I don't think the network card is the problem. The issue is the title, for whatever reason it cannot seem to get an IP from the router. The error in the title is displayed when trying to run ipconfig /renew. Also keep in mind that the Macbook has no problems and is happily connected to the Internet. So, what I've tried so far:

The router is configured to be a DHCP server. The DHCP and DNS client services on the XP machine are both running and set to automatic. TCP/IP is set to obtain an IP address automatically.

ipconfig gives the following:

Connection-specific DNS Suffix :

Autoconfiguration IP Address : 169.254.172.217

Subnet Mask : 255.255.0.0

Default Gateway : 169.254.172.217

iprenew gives the error in the title

Anyway, any help would be greatly appreciated. If you need more info, just ask.

—EDIT—
If we assign a static IP for the wired windows machine, XP thinks that it's connected (limited or no connectivity disappears, and it says it's connected), but we are unable to access the web via a browser. We're also unable to ping the router. The make of the router is Belkin, and the make is N 150 Enhanced Wireless Router.

—EDIT—
No, the DHCP is not set to wireless only (there doesn't even appear to be such a setting).