Delete or rename locked files
You’ve almost certainly come across situations where a file is locked and you can’t overwrite or delete it.
Finding that elusive process that has a lock on the file can be really problematic sometimes. Turns out there a re a few good solutions to solve the problem without killing your processes one by one until you figure out who the culprit was.
Unlocker
http://www.filehippo.com/download_unlocker/
Unlocker is a simple explorer context menu plugin that will try to solve all your resource locking woes.
EMCO UnlockIt
http://emcosoftware.com/unlock-it
A neat free utility that helps you to unlock files and folders. It allows you to take a control on resources locked by a system, applications and services. For a locked resource the application detects a list of locking processes and allows to unlock the resource by closing file and library handles or terminating locking processes. The application offers Windows Explorer integration that makes possible folders and files unlocking by just a single click in the context menu.
LockHunter
http://lockhunter.com/
It is a free tool to delete files blocked by something you do not know. LockHunter is useful for fighting against malware, and other programs that are blocking files without a reason. Unlike other similar tools it deletes files into the recycle bin so you may restore them if deleted by mistake.
IObit Unlocker
http://www.iobit.com/en/iobit-unlocker.php
IObit Unlocker is a free, light-weight and easy-to-use tool, which helps you delete, rename, move and copy the files or folders by dragging and dropping into it or just clicking the add button to select your objective files / folders.
FileASSASIN
https://www.malwarebytes.org/fileassassin/
FileASSASSIN can eradicate any type of locked files from your computer.
If you use a computer, you've probably come across at least one of the following messages:
Cannot delete file: Access is denied
Make sure the disk is not full or write-protected and that the file is not currently in use
The source or destination file may be in use
The file is in use by another program or user