Deleting All Subfolder Information

Back up your files first or at least make a copy first and do a trial run.

You want to remove all files in a subfolder

eg : c:/John Smith/my music

You have many subfolders eg "aaa" "bbb" "ccc"

eg : c:/John Smith/my music/aaa
eg : c:/John Smith/my music/bbb
eg : c:/John Smith/my music/ccc

Go to Start All programs, Accessories,  click on command prompt.

You will see c:/users/yourname>

In my example I typed:   cd my music

You will then see:     c:/users/yourname/my music>

Type del /s *.* /q

This will will leave you with all folders and subfolders, but delete all contents in the subfolders.

Be aware some files may be hidden