Please perform a reset to factory defaults:
Locate the reset hole on the back of the router - it is recessed in a small hole.
Using a paperclip or pin, push the button in for 25 seconds.
Let go, and give the router a moment to boot.
In a web browser, enter the router's IP address
When prompted for a Username and Password, enter the default username and password (admin; password) unless you have already changed it.
Under Security Options select WPA-PSK or WPA Personal, enter a new network password XXXXX the Passphrase box
WRITE DOWN or KEEP NOTE of your network name, security option and passphrase - you will require them to connect wireless computers and devices to your network.
Click Apply to save the settings.