Please contact support, Don.
You can't change the LiveID for your OneCare subscription, so I'm not sure that changing the email address would have affected your subscription status.
I guess it may be worth troubleshooting it as a subscription status problem:
If your subscription to OneCare shows expired in OneCare
If your subscription is correctly shown at the Billing site, but incorrect in OneCare and your PC date and time are correct, please contact support.
How to reach support (FAQ) - http://forums.microsoft.com/WindowsOneCare/ShowPost.aspx?PostID=2421771&SiteID=2
-steve