I’ve just migrated the only Windows PC in home, used for running hamradio software. This used to be a Toshiba Satellite notebook but bought a Mac Mini last week and installed Bootcamp and WIndows 7. Since I’m using a Hurricane Electric IPv6 tunnel (tunnelbroker.net) at home, IPv6 will be auto-configured by my router. So no need to hav Teredo and/or ISATAP running. This is how to disable it:

Start a command prompt *as Administrator* and run:

netsh int ipv6 isatap set state disabled
netsh int ipv6 6to4 set state disabled
netsh int teredo set state disable

While your busy anyway you also want to disable the RFC4941 privacy extensions, hiding your real IPv6 address so your able to remotely log in to your PC without hassle:

netsh int ipv6 set privacy state=disabled store=active
netsh int ipv6 set privacy state=disabled store=persistent

Now reboot, start a command-box and type ipconfig. You only should see your Tunnelbroker.net IPv6 address (which can be set hard in the network configuration setting anyway)