It has to be SP2 or SP3 😀

Install IPv6 protocol in the properties of the connection. The properties button will be gray and not configurable.

To configure the IPv6 address on the interface use the followng commands in cmd.exe:

netsh interface ipv6 add address "Local Area Network" 2001:abc::def:1234

netsh interface ipv6 add route ::/0 "Local Area Network" 2001:abc::1

where instead of “Local Area Network” must be the name of your connection, and insted of 2001:abc::1 - your IPv6 gateway