I have been having this problem from last 2 months.
I have HP EliteBook 8560w laptop, with windows 7 Home Premium.
All the devices in my apartment, except my laptop, are able to connect and access internet through wireless network. Therefore I know my router and wireless connection is okay.
If I take my laptop to some other place, library/ friend's apartment, it can easily connect and access internet through wi-fi. Therefore I know my wi-fi settings are okay.
It was working perfectly fine for 6 months. Somehow suddenly I am facing this problem from last 2 months.
Currently I am using LAN cable to connect to internet. And yes LAN works perfectly.
I have tried flushing/registering DNS. IP renew.
Any help on how I can debug my problem ?