Cannot reinstall product

I had to reinstall my operating system.  Before doing it, I checked on this site, and it appeared all I had to do was uninstall Norton Internet Security before reinstalling the OS and my product would be available for reinstallation afterward.

 

Well, it ISN'T.  I have the one where I can use it on three computers, and it's telling me it's already being used on three computers.  Except that one of those three computers is the one that I UNINSTALLED it from, and now I can't get it back.  I have over 200 days remaining on the subscription.

 

How do I get it to reinstall?