all of the paths in this form are for system references.
This will happen if the form is saved outside of a dreamweaver site.
When Adding form builder to a page, the page must be saved within the Dreamweaver site.
Create a new page within your dreamweaver site, and add the form to that page.
The fact that the page uses file system paths indicates the page is not saved to the DW site, this is probably the cause of the Form Builder Crashing.