My Nav bar no longer works

I am using bootstap to create a responsive site. It was goin well until the dropdowns just stopped working. Also when I upload my file somewho in the process when it reaches to the other side all my documents are blank. So I used filezilla insted, that worked but the dropdowns still didn't work. At that point I figured maybe the copy of dreamweaver cc was curpt so I deinstalled and reinstalled a clean version, the recreated my bootstrap document and still no results. I'm out of ideas... I really need to move forward with this project. does anyone have any suggestions? I was thinking maybe the Javascript needed upgrading but I do have the latest verion of the program....Someone please help.

-Nathifa