ok connect the modem to the router powered down power down router and connect to pc.Switch router on and allow to settle then switch on router allow to settle then switch on pc. Open a browser and log onto router using 192.168.*.* address thats in your manual as are the password and user name. Then browse to wireless and ensure it is on. The set a security password (encryption use wpa )
Then on wireless open whatever utility it uses and refresh ensure you highlight your router and click connect.It will ask for a key put in your password. If this does not work post back

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to the forum