Check you can do:
ping6 your_machine_name_without_the_domain

If you can’t, verify that your domain is set correctly by checking that the following key in the registry is set:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\domain

In C:\WINNT\system32\drivers\etc\hosts, add the line:
Your_IPv6_address Your.hostname.domain

Install the Mbone applications (vic, rat, sdr...) in the same directory ( For instance: C:\Program Files\Mbone\ ) and set the user environment variable HOMEDIR to this directory