You're in the wrong forum. Windows Live OneCare forums are here:
http://social.microsoft.com/Forums/en-US/category/windowsliveonecare/In any event, you don't get a code when you purchase OneCare online. Simply install OneCare trial from
http://onecare.live.com and then click subscribe in OneCare and sign in with the same LiveID used to purchase with and your installed copy will activate to your subscription. You will use this LiveID, your subscription ID, to activate on up to 2 additional computers or whenever you reinstall.
You can confirm your subscription status at
https://billing.microsoft.com -steve
Microsoft MVP Windows Live / Windows Live OneCare & Live Mesh Forum Moderator