|I have to agree with wanderer|
If you're using a SOHO Router in your home LAN, they're not IPv6 capable and use IPv4. If you have a switch (not a router)
As far as I know, by default IPv6 is enabled in Windows 7 so you shouldn't have had to enable it. As wanderer pointed out, doing and ipconfig /all would tell you (us) if it is enabled.
If for some odd reason IPv6 isn't enabled, you enable it through the network interface's properties, not by hacking the registry.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.