Local Area Connection Does Not Have Valid Ip Configuration

Local area connection doesn't have a "valid ip configuration" -how do i fix this? So i recently got a new desk for my computer, and must've uplugged something on my router because this is what comes up when i try to see what's wrong. My internet won't work when i plug in everything needed. But when it's just my modem plugged into my computer it works fine(like now). My internet is time warner and my computer is windows 7. And my router is a linksys. (I don't know if any of these are important). Anyways, my computer diagnoses the problem as my connection not having a valid ip configuration. What do i need to do to solve this?

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