Hi Joe,
I remember there being some difficulty with implementing that but can't at the moment remember what it was.
If you register with your Live Account I can transfer it to your existing account. If your existing account has the same email, then change it to a different one temporarily or it won't let you register. Just let me know the email for the new account and I can harvest the windlows live id code from it and put it on your existing account and then delete the new user.
Best,
Joe