Windows Live OneCare Help Center
Install or reinstall Windows Live OneCare
Windows Live OneCare can be installed on up to 3 computers per account. You will not be charged for installing on the second or third computer or for reinstalling. To reinstall Windows Live OneCare, uninstall your current version, restart your computer, and then reinstall Windows Live OneCare from the Windows Live OneCare Setup website.
- When you reinstall Windows Live OneCare, you don't have to enter your credit card information again. You only need to sign in using your Windows Live ID. Your information will be transferred when you reinstall.
- If you install the free 90 day trial version of Windows Live OneCare, it will automatically upgrade to the subscription version of the program as long as you have logged in with the same Windows Live ID that you used when you originally installed Windows Live OneCare.
- You will be unable to use the product key to set up Windows Live OneCare on the second or third computers. You must log on with your Windows Live ID for setup. As soon as the product key is used on the first computer, the product key has been consumed and can't be used again.
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