Cannot delete folders. Why? Can Someone Help?

Hey guys, i have the Western Digital Network Harddisk My Book World Edition (blue lights 500GB) and I have the problem that i cannot delete, rename folders. I can delete and rename files but no foldersā€¦There is always the alert comming that i need access ., what i have to do? please help :frowning:

Did you ever get this issue resolved?

If not is it possible to post a screen shot of the issue?