Hello again :)
First thing I notice from your image is you havent mastered how to properly upload themes.
When you unzip a theme.. occasionally you will have a directory like "abc" and inside "abc" will be another directory named "def" and inside "def" will be the theme files (the first hint at this will be the presence of an index.php, and a style.css, and most likely other files like sidebar.php, etc.. within the directory.
It is the "def" directory that you want to upload, not "abc"
In other words, you want :
wp-content/themes/def
where "def" is your theme name
not:
wp-content/themes/abc/def
As for any usage of dreamweaver -- dont use it. Its not an ftp client, and you should not edit wordpress themes with it. So it's useless :)
If you are on a mac there are plenty of decent ftp clients -- fetch (i guess is one used alot around here)
http://www.fetchsoftworks.com/
If you are on windows, there are 1000s.
http://www.google.com/search?hl=en&q=ftp+clients&btnG=Google+Search
I am guessing once you obtain a decent ftp client, you will be able to delete the files you are having trouble with. If not, assuming you have cpanel access, I know that you can from there.