first enable viewing of all files/folders, system and hidden files as well. (open "my computer"/Tools/Folder options/Veiw tab)
second, now see if there is anything in the folders.
third, either on the folder or file that you can't delete, rightclick/properties make sure the "read only" attribute box is fully unchecked. then go to the security tab and make sure that YOUR user account has FULL permissions, (if you only have change permissions then you won't be able to delete it).
forth, post back if non of that works, we'll dig deeper...