hope I'm not missing the point but this is what I would do.
open IE, firefox etc and in the address bar type
ftp.yoursite.com (or uk or eu - whatever)
put in your user name and password.
If this logs you in then in the menu bar select page --- open in windows explorer.
This will then open your PC with the ftp directory listed.
You can then copy, drag do what ever you want to your files.
If it works then your issue is with Dreamweaver if it does not then your issue is with permissions on your server.
Either way post back and we'll all try to help