Have you ever bump into messeges like:
Cannot delete file: Access is denied
There has been a sharing violation.
The source or destination file may be in use.
The file is in use by another program or user.
Make sure the disk is not full or write-protected and that the file is not currently in use.
Well when such cases happeneds you really want to know which application lock your Files or Folders.
The Unlocker is the solution for you.
Just look for "unlocker" in Google or Bing or you can download it from here.