No Internet with Lion. Stay away until self-assigned IP addresses are fixed!

I have a TimeCapsule (802.11n 3rd gen) and four Macs. Until two months ago all was well and everyone could connect.
Two months ago the Apple apps on the MacBook Pro stopped connecting to the Internet on the TimeCapsule network (Mail and Safari would not connect, Firefox was fine). The MacBook Pro connects on all other networks. I travel a fair amount and the computer has connected fine at all networks tried. I have sinced updated to Lion (10.7.2) and the problem is the same. The error in System Preferences indicates that the computer has a self-assigned IP address and will not be able to access the Internet - but Firefox works, so we know that is not  entirely the case.
Last week our desktop stopped being able to access the Internet using the TimeCapsule network. Problems the same as the MacBook but the desktop Mac is using Snow Leopard.
Our older laptop is using an earlier version of OSX and all is well. Out antique Mac laptop is also working well.
We also have a Verizon MiFi and all machines can access the Internet on that.
I have tried every "fix" I can find on the boards and through Google. Nothing works. From the looks of the boards, there are thousands of users with this problem and no answer from Apple.
I was much better off before I switched to Lion. In those days, I just used Firefox and looked at my iPad when I needed mail (and waited to sync at the office). But with Lion comes iCloud and an increased reliance on the App store, making  internet connectivity through Apple apps is a must. Can someone from Apple help us fix this? Does anyone have any suggestions?

That is what I told Comcast, but they said since my
computer works "fine" in Safe-Boot,
Classic, and the other PC—then they
conclude there's no problem with their hardware and
that its not their problem; that its Apple's issue.
And nope I'm not connected wirelessly, it's through a
basic ethernet cable.
I don't know who to blame for this. Five years ago, this never happened, but it is common now. It affects both Macs and PCs, but as usual, people like Comcast will make an effort to fix a PC but throw up their hands with a Mac. Go figure.
So, what speed, duplex and adapter type numbers
should I put in?
I don't know for sure. Start with duplex. If it current says "auto", change it to "full". If that doesn't work, or if it already was "full", change it to "half". If still nothing, switch it back to "auto" and fiddle with all the 10/100 speed combinations. You may have to go back and try different duplex and speed combinations! It sounds harder than it is. Try changing the duplex and adapter settings from "auto" before changing the speed. I'm am on my work Dell right now (which needed the same fix BTW), so I can't give you very good step-by-step instructions.
The thing that troubles me is why is it that the
internet works fine in Safe-Boot and Classic, but not
Normal OS X mode?
No clue about that.

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