Thinkpad 430u Windows 7 - Public Network - Wireless router is not assigning IP address

Hello,
My computer knowledge is limited, but I have a chronic issue when attempting to connect to public wireless networks, ie a coffee shop:
When I attempt to connect, the laptop identifies the public network as an Unidentified Network and although it "connects" it says No Internet Access. Normally, when I connect, I would be prompted to selected Home, Work, Public and this does NOT happen. In the Network and Sharing Center, under the heading "View your active Networks" it says Unidentified Netowork, Public Network; Access type: No Internet Access, Connections: Wireless Network Connection (name of network). The words "Public Network" is NOT a hyperlink and cannot be clicked on.
When I run run cmd and check ipconfig I find that the wireless router is not assigning an ip address to my laptop. i then input ipconfig/releasei, and ipconfig/renew. I then receive and error saying "An error occurred while renewing interface Wireless Network Connection: The operation was canceled by the user."
I have turned off my firewall.
My smart phone can connect the the internet with no problem and the other laptop users have no problem either. This indicates there is no problem with the wirless router itself, but is some kind of setting or something that needs to be adjusted on my end.
Autoconfiguration IPv4 Address: 169.254.86.100
Subnet mask: 255.255.0.0
Default gateway: n/a
Please, any help is appreciate. This is a chronic problem any time I link to public networks.
P.S. I have no problem connecting to the internet in my own home
Thank you!!

Sorry, forgot to include: it's a 2Wire 2701hg-b Residential Gateway. I'm unsure how old the model itself is--it was just given to us by AT&T (it's the model they use for their U-verse service). I checked today and the firmware is up-to-date.
Thanks.

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Thinkpad 430u Windows 7 - Public Network - Wireless router is not assigning IP address

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