I cannot connect to the internet, but skype and mail is able to.

Using a MacBook Pro OS X Ver. 10.7.5

Yesterday something happened so Google Chrome - Safari - Firefox where not able to connect to the internet through a wireless connection. I tried changing network to 3 different, still does not work. My iPhone, my other macbook and my iMac changes between these networks with out any problem.

I looked at proxyies, renewed the DhCp Lease, it is still not working. I can use skyp and Mail with out any problem.

I think my battery life changed drasticly as well. (Being only able to keep 50% of what it could before.)

What happened?