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
Can unload DLLs from processes
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

http://lockhunter.com/download.htm

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