Laptop internet connection no longer works after adding Time Capsule to network

The other day I was setting up my Time Capsule for the first time at my new apartment (after having it in a box for months). I've got internet access through my apartment, so I haven't needed to use it as a router like I did the last time I used it. Also, the router is in another tenant's room. So I opened Airport Utility and adjusted the settings to add the Time Capsule to the network. After doing this, my laptop has lost its Internet connection. I can still connect to the network and my iPad has had no issues connecting to the same network and using the Internet, but the Internet won't work on my MacBook Pro (2006 model).
Since then, I've plugged an ethernet cable between my laptop and Time Capsule so I could find it on Airport Utility and change its settings to connect to the laptop via Ethernet. Also, I called my landlord and got the router reset.
I know the Time Capsule/Airport Utility is involved because the Internet connection died as soon as I tried adding my Time Capsule to the network.
Any suggestions?

I am having the same problem. It worked fine (connecting my iOS devices to my macbook pro using internet sharing) until Lion. Then it all went to ****.

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Laptop internet connection no longer works after adding Time Capsule to network

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