Problems with EXE file

I am owner of application calls: www.muscleandmotion.com

My customres download EXE file from my website, and some of them complain that Norton deletes the EXE file and tells them it's a virus...

How do I solve this problem? And getting Norton to recognize our EXE file as secure?
The download file (exe) is here: http://www.muscleandmotion.com/freetrial.aspx

How should I talk with?

Regards,

Amit G. Alon