I actually had a hard time tracking down how to show the Solicited Nodes Multicast Group in Windows. I have to thank Vladimir Kuchar on the Cisco forums for letting me in on the command.
I really think Microsoft should include this as part of an IPCONFIG command.
Anyways… the command to check the Solicited Nodes Multicast Group in windows goes like this:
Open a Command Prompt
Type: netsh interface ipv6 show joins
All the addresses that start with ff02:: are Solicited Nodes Multicast Groups.
Hope this helps!