Open OneCare and click Help/About to see your subscription LiveID that you need to use to sign in at
https://billing.microsoft.com Note, however, that you should be gettng a free extension and there will be no charge - it should be automatic.
Or, go ahead and uninstall OneCare and install Microsoft Security Essentials (Morro was the code name) which was released just under 2 weeks ago:
http://www.microsoft.com/security_essentials/If you are charged for renewal of OneCare, contact support to cancel and get a refund.
Or, if you are unable to access your account on the Billing site....
How to reach support (FAQ) - http://social.microsoft.com/Forums/en-US/onecareinstallandactivate/thread/30400b52-7f26-4ba0-bc18-17e305329d90
-steve
Microsoft MVP Windows Live / Windows Live OneCare, Live Mesh, & MS Security Essentials Forums Moderator