i have gone through these steps and when i enter my product key it says...
The product key entered is already in use.
If you are installing OneCare on a 2nd or 3rd computer or you are reinstalling OneCare, you do not need to use your product key again. Instead, close this browser window, return to OneCare, and click Activate again. On the Sign in page, sign in with the Windows Live ID that you originally used to install OneCare.
When i got computer, windows live one care was set up for me, and i dont know the Windows Live ID that was originally used. what do i do?