Macbook Pro and D-link Wireless issues

I bought my macbook pro from my school because I obtain a computer grant. The macbook pro came with a certain programs installed for my school UNC-CH. I had never had any problems with my internet connection until my parents changed our linksys wireless router for a D-Link router. My macbook pro does not connect to the internet for some sort of reason. The air port says that I have DNS and an assigned IP address; but for some reason my web browser and my applications say that I am not connected to the internet. Whenever I connect my macbook pro to the wirelss router through a ethernet cable, everything works fine. The problme only occurs over the Wi-Fi. My brother has a Macbook Air and he does not have any internet issues. I also have a thunderbolt display that has no issues witht the wire-less network. Do you think that the problem arises because of the added programs that my school added to my computer? I know that my Universtiy is very strct when it comes to connecting to the internet. My macbook pro came with a program called NAC Agent; which I use to communicate with my school's internet connection. I have tried closing the program while I am at home and having it on; but noihing seems to work.
Any ideas?
P.S.
I curently use my thunderbolt display's Wi-Fi to power my internet connection through the Bluetooth PAN connection.

Thanks for the feedback LilyLC. I too have gone through all of your steps and a host of others. Still with no luck. No problems at all with my Airport Express, but still no way to keep up a connection with my DIR-655 via WIFI N. I tried all of the steps with each firmware version too. I've given up at this point. I want the 2 months of my life back that I spent troubleshooting this mess. At least Apple could acknowledge this and say we are on it, and that it isn't only "in our heads."
/begin rant/
I think that Apple needs to do some re-evaluating of their software release schedule/quality control. At this point I would rather wait and have them get it right then put out subpar updates and fall into the downward spiral pattern of "the rest of them". My confidence has been shaken and I've been a mac fan since the beginning. I just want Apple to split off the iPod/Phone/TV etc. into its own division and to get back on track with the Mac line starting now. We need this stuff to work to make a living and this takes a higher priority in my mind than new twiddle apps on the iPhone.
I do own two iPods and an iPhone but would chuck them in a river to get Leopard working solidly with the majors like Adobe, Extensis, Epson, as well as stable networking, syncing and backups. Apple really has their hands full at this point with a large list of bugs. I really wish them well but can't say I'm in the least bit happy as a consumer at this point. For the first time in a long time I feel sheepish when answering whether or not I'd recommend a Mac, and that hurts me deeply for some reason.
/end rant/

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