In order to " Take Ownership " go to this link, Take Ownership Shortcut
It will add an item to the context menu " Take Ownership " , Than right click
on " Media " . This will take ownership of the Media file and all sub folders.
Than highlight all the Sounds ( the *.wav Files ) than cut and paste, or just drag
this group to the newly created " Media Backup " file.
This will keep the sound files available if you ever want to recover them.
Hope this helps, Please let me know