I have internet but browsers won't work(mozila, IE, Opera etc..)

* If the problem was found in ur computer then u have to do some things.
==>Goto the Start
--> In search box,
--->type cmd
--> Then "CMD"
will be displayed in the search
--> Now right-click on "CMD"
---> Select "Run as administrator". 
Now enter this command 
==>netsh int ip reset resetlog.txt 
-->Press "Enter". 
Reboot your computer".
Thats all. Problem should be solve..