To cancel automatic renewal
if you purchased your subscription with a credit card and you have your credit card on file with Microsoft Billing and Account Management, Microsoft will renew your subscription automatically on the renewal date.
Or please contact support -
How to reach support (FAQ) - http://forums.microsoft.com/WindowsOneCare/ShowPost.aspx?PostID=2421771&SiteID=2
If you are billed for renewal, contact support to cancel the account and obtain a refund. Then reinstall and activate with a new LiveID and a retail key, which will never be automatically renewed.
-thanks from steve
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