open a command window as administrator
netsh interface isatap set state disabled
netsh interface teredo set state disable
netsh interface 6to4 set state disabled
Now go to registery and add a DWORD "DisabledComponents" with 32bit if it is not already there and set it to: FFFFFFFF
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\DisabledComponents
You now are not tunneling through ipv6