Sometime your browsers will not work although your internet connection is ok.
In this case follow the steps to overcome your problem
1. windows start menu=> search => type " emd " => you will get " Command Prompt " apps.
2.Open " command prompt" as administrator (by right click you will get "run as administrator")
3.you will see a black window. type at the end of the bottom line " netsh winsock reset "
4. Click " enter button ".
5. this will give you a successful message. Restart your computer. that's all.