This script will disable IPV6 to various degrees within the Vista OS by performing a registry change.

HKLM\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\DisabledComponents=000000ff (DWORD)

To undo changes, either delete `DisabledComponents" or set it to 0.

Disable all tunnel interfaces: 0x1

Disable 6to4: 0x2

Disable ISATAP: 0x4

Disable Teredo: 0x8

Disable Teredo and 6to4: 0xA

Disable all LAN and PPP interfaces: 0x10

Disable all LAN, PPP, and tunnel interfaces: 0x11

Prefer IPv4 over IPv6: 0x20

Disable IPv6 over all interfaces and prefer IPv4 to IPv6: 0xFF