|I would start with cycling the power on the router. Unplug it, count to ten slowly, plug it back in, let it boot and then see if your laptop can connect.|
If not, I would delete that profile from the wireless connection manager on your laptop and then try connecting to your home WLAN again.
If that doesn't do the trick, check inside the router's management interface and make sure you haven't somehow set it so the MAC of your laptop is disallowed. Also, check to ensure you haven't set it to only allow specific MAC addresses you specify to connect, and then didn't add the MAC from 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.