How did you purchase OneCare? Did you install from a retail CD or did you purchase and activate online?
If you have not activated OneCare, then follow the instructions from eaLazerBeam's post.
If you activated/subscribed, and if your subscription to OneCare shows expired or about to expire in OneCare
- Check your PC date and time.
- Check your subscription status by logging in with your subscription LiveID at http://billing.microsoft.com
- Confirm that this is the same LiveID shown to be the Subscription ID in OneCare - Help/About...
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