hi, did you bring NB to try another route, or change channel withour auto, reset route..etc. make your wireless environment to sample.
try to ping a website like google
get to a command prompt and type ping www.google.com -t
if you get continues replies your internet connection is fine. try doing this when your browsing and after browsing or downloading. if you cant browse and if ping is returning a reply from google it might mean that your firewall is blocking http requests.
how ever it cant be a porblem with your router
if possible try testing with another router for a long time.