I got a Idea
Make some webpage, on some free hosting site.
Put google analytics on it.
Put a web browser hidden in your program, on form load navigate it to your page.
check you google analytics and it will show you how many people visit the website for how long, it doesn't give you IP address's but it tell you how long people use it and how many people....
It counts as another view if they restart the program....It would work if you just want to see how popular the program is.