So, I need to manually configure the IPs on the PCs? That's odd, because the router is supposed to work as a DHCP host and provide IP addresses of it's own to any PCs connected to the network. At least, that's what I have it set up as. Basically, when I run the setup off the CD, it checks for internet connectivity first, then asks me to plug the router in, then the modem into the router. At this point, I get to configure the router (network ID, how I get my IP address, etc.), and when I'm done that, somehow it still works when I connect it via wireless. When I try to configure it manually, all I'm changing is my network ID, and I tell it to acquire an IP address automatically from a DHCP. At this point, I save the setup, and my connection is able to receive packets, but it does not send any (the connection from PC to router). I'm assuming that this results in the DHCP server not getting any response from the PC, so it discontinues communication or something like that.
Everything above is just for further clarification, I'm going for a trip next week, and when I come back, I plan to mess around with the router a little more, using your suggestions and a few of my own ideas. If it still continues to give me trouble, I'll send a reply back in this thread.
Thanks a lot for your help.