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Disabling IPv6 from Windows Vista

from: Chicago Tech
Unlike Windows XP, IPv6 in Windows Vista cannot be uninstalled. However, you can disable IPv6 in Windows Vista by doing one of the following:
I.
1. Run regedit.
2. Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\tcpip6 \Parameters\DisabledComponents. If you don't see DisabledComponents, create it by adding the following registry value (DWORD type).
3. Change one or some values:
1 = Disable tunnel interfaces
2 = Disable 6to4
3 = Disable ISATAP
8 = Disable Teredo
16 = Disable LAN and PPP interfaces
32 = Set preference of IPv4 over IPv6
255 = Disable IPv6 completely

Note:
1) You must restart the computer for the changes to the DisabledComponents registry value to take effect.
2) This method disables IPv6 on all your LAN interfaces, connections, and tunnel interfaces but does not disable the IPv6 loopback interface. You must restart the computer for this registry value to take effect.

II.
1. Open the properties of the LAN.
2. Clear the check box next to the Internet Protocol version 6 (TCP/IPv6) component in the list under This connection uses the following items.

This method disables IPv6 on your LAN interfaces and connections, but does not disable IPv6 on tunnel interfaces or the IPv6 loopback interface.

FYI
Should I disable IPv6 on Vista
Q: My Vista have some incompatible issue with the router. Should I disable IPv6 on Vista?
A: It is not recommended to disable IPv6. If you disable IPv6,...

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