LockHunter - It is a free tool to delete files blocked by something you do not know.
FileASSASSIN - FileASSASSIN is an application that can delete any type of locked files that are on your computer.
IObit Unlocker - Never Worry about “Cannot Delete Files” on Your PC
Wise Force Deleter - Delete Any File That Windows Can’t Delete.
EMCO UnLock IT - Unlock file or folder, locked by the system or by an application
Delete Doctor - Disk Cleaner Software Info and Download page. Clean Disk Security and other popular disk cleaning software.