I cannot remember the Windows ID that I used for a Windows Live One Care activation. I have the product key and I probably can remember the password. I need the ID associated with the product key. How do I get that?
If you don't recall the LiveID you used for your subscription, you will need to contact support who can provide that information to you using your Key and/or contact information.
Alternatively, sign in at http://billing.microsoft.com with email addresses that you have set up as LiveIDs and one will show your subscription listed - that would the LiveID to use to activate the reinstall.