Before I start off describing my connectivity issues, I would like to say that I have A) been a long time fan of Tom's Hardware and the work that is done here and B) spent about 7 hours or so trying to solve the problem on my own before I resorting to posting in the forum.
My issue is the nefarious "Local Connectivity Only" error that is so common on my Window's Vista 64 bit operating system. Everything was working fine until I installed a new router after the old one failed. All of my other electronics (3 laptops, several smart phones) have connected without issue, but my gaming desktop has failed to connect.
To start out with I will say what I have tried to do to fix the problem. I have installed and uninstalled the hardware and software that came with my wireless card (D-Link 2320), and updated the drivers for said card. I have neglected to install D-Link's wireless manager, because I find no issue in using Window's and have had issues with D-Link's manager in the past, so I thought that could be a potential issue.
I have also released, renewed, and flushed via the command prompt half a dozen times, all to no avail. I will post my IPCONFIG results at the bottom of my post.
Additionally, I have also installed a Window's "Fix-it" that added and adjusted my registry.
One thing I noticed is that the 2320 is a g only card, any chance your router requires you to allow g connections as well as N? Also, thank you for the details and would you mind telling me the model of the new router?