Can't transfer files form one folder to the other under Windows 10

The library software I use installs downloaded audiobooks to my music folder.  I need to transfer them manually to the Audiobooks folder if I want to use the audiobook features! It was no problem until we upgraded to Windows 10.

Now when I try to move files from my ‘music’ to my ‘audiobooks’ folder, I get a message that says “Waiting: Sansa Clip Zip 8GB is busy.” . 

The folders containing the audiobook transfer to the new spot.  The ‘alb’ file in the folder transfers.  It is only the actual MP3s that seem unable to be moved, for some reason.

Any ideas what to do about this?

I am having the same problem after upgrading to windows 10. Have you gotten an answer from anyone?