Need Help Connecting To The Internet

I reinstalled windows and now I cant connect to the internet I tried many things and even called Comcast. they said that I have to talk to a computer tech guy because its not a problem with the router. So now I need you guys to help me out. I have 3 computers connected to the router with the internet working fine.
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  1. Open a command prompt, type "ipconfig/all" and post the output here.

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