Connected to router but cannot open a browser page

I have an HP with Vista. I have DSL service through Qwest and have an action tech router/modem combo. I have three laptops running off this wireless network and my computer is the only one that won’t access the internet. When I go to available networks it shows that i am connected to my network and signal strength is excellent. I am thinking this has got to be something relatively simple, but I’m at a loss here. Any help would really be appreciated. Thanks