Yes, it would be best to reconfigure it. Try the following but note.. resetting the router will erase all previously given settings.
First, reset the router - when the unit is on, press the reset button (using a paper clip) for 20 seconds then let go of the button. Once the WLAN light is solid, it means that router has rebooted.
Go to a computer wired to the router and open Internet Explorer, enter
http://192.168.0.1 on the address bar. Enter admin for the username and leave the password blank.
Once you're in the Dlink page, this is where you can configure your Internet and Wireless settings again. Just run through the setup process (as if you just got the device out it's box).
Goodluck!
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