To disable isatap teredo and 6to4 on a Windows 7 workstation, type the following at the prompt. You do of course need Administrative access on the workstation to do this.
If like myself your running dual stack IPv6 via your router or gateway, then there is really no need to have them running.
netsh int ipv6 isatap set state disabled netsh int ipv6 6to4 set state disabled netsh interface teredo set state disable
To re-enable isatap teredo nd 6to4, just replace the disabled with enable using the commands above.