We used to have a downloadable version of the tools that would run as an exe in Windows. We no longer supply those. It sounds like j_r_gibson has the old exe.

It sounds Norton is just being over-cautious deleting it.

j_r_gibson, you should switch to the online version, which we decided to make free to non-subscribers:
https://www.guitartricks.com/freechordfinder.php

Have fun,
Jon