How To add an exception for a program?

Avast Internet Security wont allow a program I have to run, it stops the program every time but I cannot find out how to tell Avast this program is safe. Can anyone help with this seemingly simple thing? (the program is Dream Aquarium Screensaver)

what is the message from avast?

You can upload and report FP to avast here: http://www.avast.com/contact-form.php

you can also use mail

send to virus@avast.com in a password protected zip file
mail subject: False Positive
zip password: infected

or you can send files from avast chest
how to use the chest. http://www.avast.com/faq.php?article=AVKB21