Wireless Router Problems

I hope this is the right spot for this. I'm getting desperate for help.

I have a d-link dl-514 wireless router. Cable modem goes into it and I have a desktop wired into it along with another computer, both of which work great.

However, I can't connect wireless to it. The laptop sees the network, gets a new IP, and everything seems to be great, but I can't even ping it, much less connect to the internet.

I bring home a PC laptop and everything works great. Anyone have any idea as to what I'm missing on my macs? It seems like it's some small thing I'm just not catching.

 

Got it working. Tried your suggestion with a couple of other things and it's working.

Thanks!