I have tried reinstalling but I can't remember my e-mail address used for the initial installation and it won't let me reinstall with out. How do I go about finding out what address I used?
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.