Cannot delete folder it is Being Used by Another Person or Program

When encountering any of these errors:
Cannot delete folder it is Being Used by Another Person or Program
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.

Freeware program Unlocker will allow you to right click the file or folder, select Unlocker and allow you to unlock the file or kill the related process.

more info on unlocker is available at the Unlocker website.