Hi Linda,
Thanks for becoming an owner. Let's see if ListMail will work for you, shall we?
ListMail is intended to run on a commercial web host using a domain that you register. It is a PHP "script", not a Windows .exe "program". It runs on your web site and is accessible from anywhere you have access to the internet.
If this is not what you expected (you may have no idea how to set up a domain and a web site), I will be happy to refund your purchase. Please let me know if you have any further questions!
Regards