Laptop wifi showing status as connected but unable to browse

Registration date
Wednesday October 15, 2014
Last seen
October 21, 2014
- Oct 21, 2014 at 04:57 AM
I am using Sony F series laptop with window 8 which is legal version of windows os. I am having D-Link ADSL router and using it since 1 year.
My laptop was working fine with this router initially. I connect all the wifi devices to this router. But suddenly I am experiencing problem with my wifi connection.My laptop is showing wifi connection status as connected with internet access to it. But it doesn't update my anti virus as well as I am unable to open any website from any browser.
When i connect same laptop with ethernet cablethen it is connecting as well as I can browse or download stuffs on intenet.

Other wifi devices are still working properly with same setting and router. But my laptop is showing this problem since many days. I also checked firewall setting in my laptop as well as antivirus.
I updated my wifi driver. Re installed it as well as set all the connection parameters. But still it is showing me status as connected but I cannot access internet still it shows available internet access status. please help me out. tried everything. Is there any way?