If you purchased One Care online Open One Care, select "Subscribe" and when asked for a Live ID enter the Live ID and password used to purchase One Care. Your subscription status will be recognized and One Care will activate.
If you purchased a One Care CD, open One Care, select "Subscribe"follow the prompts to the payment page and when asked for a method of payment select "Pre-paid PIN or Token". Enter the 25 digit product key and your subscription will activate.