UnLocker (Freeware)

Ever had such an annoying message given by Windows?

"Cannot delete Folder:It is being used by another person or program.
Close any programs that might be using the file and try again"

It has many other flavors:
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.
http://ccollomb.free.fr/unlocker