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For Windows 7 however doing it on NIC properties should be enough.Run this from command prompt reg add hklm\system\currentcontrolset\services\tcpip6\parameters /v DisabledComponents /t REG_DWORD /d 255 and then reboot.MS Utilities:http://support.microsoft.com/kb/929852Disabling IPv6 might be a good idea, because the protocol consumes additional CPU time and system memory as well as bandwidth. Of course the resource usage of an internet protocol is pretty low, but why would you waste resources for 2 internet protocols, 1 is already enough.Enabling another internet protocol might also increase your vulnerability to possible exploits. If there is going to be an IPv6 exploit and you are only using IPv4, you won’t be affected. Disable IPv6 for tunnel adapter & interfacesIf you are not familiar with editing the registry, I created a .reg file for you that you can use to add the registry key and disable IPv6. To verify that this file is ok, open it with a notepad once, it only includes the following lines: Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\TCPIP6\Parameters] “DisabledComponents”=dword:ffffffffhttp://windows7themes.net/en-us/disable-ipv6-windows-7/