|If temporarily disabling the firewall doesn't do the trick, make sure you're entering the encryption key correctly. From the sounds of it, you've changed equipment and I know from personal experience when doing so, it's easy to typo your key.|
If necessary, go back into the wireless portion of the router's management interface and re-enter your key and then ensure you're using the exact same one on the laptop.
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.