Thanks for the response, but unfortunately, in my case - the problem only WORSENED after I upgraded the firmware!
Not only can't I connect (wireless) via my laptop - my desktop no longer can connect to the internet!! Prior to the firmware upgrade, the desktop had no problem.
Only my wife and kids use the desktop, hence my need for the wireless connection. However, the router has essentially become completely useless since upgrading the firmware.
Called DLink support again today. They blamed the problem on Verizon. Just got off the phone a few minutes ago with Verizon - after talking with them for more than an hour. The problem isn't Verizon, as my modem works fine. If I plug the laptop or desktop into the modem, I can connect to the internet (no wireless). However, once I connect through the router - I CANNOT connect to the internet, meaning the problem lies with DLink!
Even tried reseting the router. Still have the same problem.
Seems like the only remaining option is find the original software and reinstall the original software and forget about the useless firmware upgrade.