LockHunter is a foolproof file unlocker
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.
Key Features

* Shows processes locking a file or folder
* Allows to unlock, delete, copy or rename a locked file
* Allows to kill locking process
* Allows to remove locking processes from hard drive
* Integrates in to Explorer menu
* It deletes files into the recycle bin, so you may restore them if deleted by mistake
* Supports both 32 and 64bit Windows