Let's assume your laptop is running Windows 7.
In your taskbar is a small icon that looks like five bars arranged like stairs. Left-click, and a small window will open, listing your available wireless network connections.
Are you connected to yours? If so, right-click the name of your network and select "Status". This will give you the current status of your network. Check from there to see if your IPv4 and IPv6 connections both have Internet connection, then look in the "Details..." section.
There is most likely a problem with your laptop connecting to the DNS server. Check your DNS gateway and similar areas.