First of all, there is support. You just posted to the peer to peer support forum where fellow customers can and do provide help.
How to reach support (FAQ) - http://forums.microsoft.com/WindowsOneCare/ShowPost.aspx?PostID=2421771&SiteID=2
If you are unable to sign in to activate your subscription and have a valid LiveID, I suspect you have run into an activation "bug" where a password that is longer than 8 characters fails to allow you to log in. Change the password at http://account.live.com, activate, then change the password as you wish once again.
-steve