How to disable IPv6 with Vista and Windows 7

Add the following Registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\tcpip6\Parameters\

Create the following registry value (DWORD type): DisabledComponents

Note that “DisabledComponents” is case sensitive and should be typed exactly like that.

DisabledComponents is set to 0 by default. To disable IPv6 support on all interfaces, set the value to FFFFFFFF.

Using the Network Properties GUI will disable IPv6 on your LAN interfaces and connections, but does not disable IPv6 on tunnel interfaces or the IPv6 loopback interface.