Hi, I suspect here you are referring to TCP/IP stack the protocol that controls the internet connection.
Click on Start button, all programs accessories and right click on "command prompt" select "run as administrator" At the prompt type:-
netsh int ip reset and then press the Enter key.
Restart the computer.
The command will remove all user configured settings on TCP/IP stack. Returning it to original default state. Pertinent registry keys are rewritten those used by the Internet Protocol (TCP/IP) stack. This achieves the same result as the removal and the reinstallation of the protocol. The registry keys affected are: