can’t install – please help

This is my 3rd WP blog installation. I have had NO problems in the past. I have done the 5 min. installation. I can’t get the install.php to open in the browser. It keeps trying to open in DreamWeaver.

Link is http://www.ourheartministries.com/blog/wp-admin/install.php

Can anyone help? I am at my wits end!

Thanks!
Rhonda