Deleting "write-protected" folders?

SanDisk MP3 players Sansa® Clip | Sansa® Clip+
4

I have the same problem.  I can delete mp3s from my sansa fuze, but I cannot delete the folders because they are write protected.  When I look at the folders’ properties, the “read only” box is grayed out, thus preventing me from changing the property.  This causes difficulty in managing and organizing my files.