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A network key is either the WEP or Pre-shared key that was configured when you were using this router previously. The easiest thing to do is start from the beginning be resetting to factory defaults. I can help you with this. Give me the full make/model of the router.
Isn't the network key the thing that's taped to the bottom of the router? Find the manual and as a last resort the reset button and try to write down passwords next time.