Why is my wi-fi signal is going strong, but I can't connect to the internet?

Before I begin, here's my set-up:
My wi-fi signal (on the top right side of my MacBook) is going strong (with all the bars). And a green light is lit up on my Airport Extreme. For some reason, I still can't connect to the internet/use Apple Mail/use iChat. I don't think that there's anything wrong with my MacBook, as my wife isn't able to connect to the internet with her iPad or with her laptop either.
I'm thinking that I have the strong wi-fi signal showing up on my computer because it actually is connecting to the Airport Extreme, yet the airport extreme somehow isn't connected to or isn't able to connect to the router. Would this be correct? Any ideas of how I might fix this? I tried unplugging and replugging everything for a few seconds. However, whenever I use a hardwire ethernet connection to my MacBook, my internet and everything works.
ALSO, of note, I just purchased an Apple Time Capsule. I just realized that it functions as a wi-fi base. Any chance that my computer, my wife's iPad and laptop are just connecting to the Time Capsule instead of the Airport Extreme?
Any answers would be more than appreciated. Thanks!

Deselect Proxies if selected.
Safari > Preferences > Advanced > Proxies:
Click "Change Settings" button
The network preferences window for Proxies will will show up with "Proxies"
tab selected.
Under "Select Protocol", uncheck any box if selected.
Click "OK", then "Apply"

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Message was edited by: Crimsondude

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~~~~~~~~~~~~~~~
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