|I'm not at all familiar with netgear equipment but I'll take a whack at this.|
1) Ensure your computer is plugged into a LAN port on the router
2) Double check the manual/setup guide that came with the unit to ensure you're using the correct IP address
3) If you you were typing in the correct address, try resetting the router to it's factory defaults according to the process that should be listed in the guide/manual
4) If none of the above fix the issue, take the router back and exchange it for a new one as there has to be something wrong with the one you bought. I would suggest you get the people at the electronics store to verify it's working correctly before finishing the transaction and taking it home.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.