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How To Disable IPV6 in Windows 7

* This should also apply to Windows Vista
* This will basically disable ipv6 to the point where it won't create any of the garbage IP6 tunnels, etc in ipconfig /all
* It was necessary in my case where even with IPV6 protocol unchecked as an item in the adapter interface it would still create DNS entries for the IPV6 address when registering itself then those IPV6 addresses would be returned for DNS queries for my servers and the traffic would go nowhere!!!
* In most cases it still failed over after short time, in other cases it returned 'no route to host'.... like when trying promote to domain controller and specifying an existing DC during the process

TO DISABLE IPV6 ALMOST ENTIRELY:
Taken From: http://www.mydigitallife.info/2007/09/09/disable-and-turn-off-ipv6-suppo...

It’s also possible to disable IPv6 and/or Teredo via Vista system registry. The registry settings also allow users to selectively disable components and configure behaviors for IPv6 in Windows Vista.

Open Registry Editor (regedit).
Navigate to the following registry key branch:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\tcpip6\Parameters\

Create the following registry value (DWORD type):
DisabledComponents

Note that the name must be exactly as shown, including capitalization. DisabledComponents is set to 0 by default.

The DisabledComponents registry value is a bit mask that controls the following series of flags, starting with the low order bit (Bit 0). To determine the value of DisabledComponents for a specific set of bits, the process is complicated, were hexadecimal value is calculated from binary number of the bits in correct position. For convenient, the following table lists some common configuration combinations and the corresponding DWORD value of DisabledComponents.
||!Configuration combination||!DisabledComponents value||
||Disable all tunnel interfaces||0×1||
||Disable 6to4||0×2||
||Disable ISATAP||0×4||
||Disable Teredo||0×8||
||Disable Teredo and 6to4||0xA||
||Disable all LAN and PPP interfaces||0×10||
||Disable all LAN, PPP, and tunnel interfaces||0×11||
||Prefer IPv4 over IPv6||0×20||
||Disable IPv6 over all interfaces and prefer IPv4 to IPv6||0xFF||

As seen from table above, to disable IPv6 support globally on all interface, set the value data for DisabledComponents to 000000FF, or simply FF. The registry entry will look like below:

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters]
"DisabledComponents"=dword:000000ff

Restart the computer for changes to take effect.
To revert and enable IPv6, delete “DisabledComponents” registry key or set its registry value to 0.