Problem With Airport Connection6

I am trying to connect my MacBook Pro to the Internet wifi,but I am having problems. It connects to any wireless connection available just fine, and it shows the bars are connected, but when I try to go on a web site, I get a message telling me that I am not connected to the Internet. I have tried numerous wireless connections and I get the same result. When I connect directly to the router via Ethernet it works perfectly fine.

Yesterday I download and installed a new update for the airport. Do not know if that may be the problem.

Thank you for taking the time to help me.