LockHunter - It is a free tool to delete files blocked by something you do not know.
Hirens BootCD - Hirens BootCD is a powerful, all-in-one boot disk utility that will help you resolve and make reformatting your computer easily.
Wise Force Deleter - Delete Any File That Windows Can’t Delete.
Ultimate Boot CD - The last Boot CD you'll ever need. You need the Ultimate Boot CD if you want to:
FileASSASSIN - FileASSASSIN is an application that can delete any type of locked files that are on your computer.
Rufus - Rufus is a piece of software that allows you to transform a portable drive, like a flash drive or other USB drives, into a bootable drive that can be used for a variety of purposes. Read more about Rufus.