Unlike Windows XP,IPv6 in Windows Vista cannot be uninstalled.
To disable IPv6 on a specific connection, you can go to the Network Connections
folder, obtain properties of the connection and clear the check box next to the
Internet Protocol version 6 (TCP/IPv6) component in the list. This method disables
IPv6 on your LAN interfaces and connections, but does not disable IPv6 on tunnel
interfaces or the IPv6 loopback interface.
To selectively disable IPv6 components and configure behaviors for IPv6 in
Windows Vista,createand configure the following registry value (DWORD type)