Problem with file name

Hi,
My problem started with copying a parent folder.when I do so I am
getting an error " File system error". Then I opened each folders but
one isn't opening at every subfolders, required files are in that
particular folder. So I tried to rename but it is not allowing then I
renamed the parent folder. Then it is allowing to modify . I think it
is a problem with long file name ( It is little bit long.

Any solution to effectively rectify this.

Thanks to all. San