no mate thats not what the problem is, the files he wants to delete are using a none standard naming system outside the typical 0-1 a-z A-Z lettering conventions. back in the days of 8,3 naming system we used to use characters like !"£$ and so on as the first letter to hide files and folders from the directory search. which meant unless you knew exactly what the file was called you could never see it in the files and folders lists.
today it still shows up now and again. the files are easy enough to remove if you know what your looking for, but there still a pain when you come across them...