Install and Uninstall IPv6 in Windows

To install and uninstall IPv6:

Click Start > Run > cmd

At the command prompt, type "netsh int ipv6 install" and press the Enter.

Close the Command Prompt window.

To uninstall IPv6:

Click Start > Run > cmd

At the command prompt, type  "netsh int ipv6 uninstall" and press the Enter key on your keyboard.

Close the Command Prompt window and restart the computer.

or
  
Open Network Connections

Right-click local area connection, and then click Properties.

Click Microsoft TCP/IP version 6 , and then click Uninstall, click Yes.

Click Close to save changes to your network connection.