Why won't my laptop connect to Internet via bt he hub?

Basically my laptop either says limited connection or says it connected but no Internet loads! When I run diagnose it says that dns is working properly? I am able to connect on my iPhone but not laptop! I have tried changing settings on home hub but nothing works. My xbox also says tht my NAT is on strict, how to I change it? And I%26#039;m runing windows 7.|||Log on to BT.COM, click on AT HOME, then browse for answers, if no joy you can open up a live-chat session with a BT rep, they should take ownership and point you in the right direction