Wireless Internet Problem

My laptop is having a problem connecting to the internet. It connects to the wireless network fine, but says I only have limited access and won?t allow me to connect to the internet.

The host computer is in my brother?s room and me and my dad have laptops. His laptop can access the internet with no problem. Mine connects to the network, but it can?t access the internet.

My computer came with a free version of norton anti-virus that expired about 5 months ago. I got tired of the annoying popups to renew, so I uninstalled the program. Since then I have not been able to connect to the internet through the wireless.

Can someone help? thanks