LockHunter - It is a free tool to delete files blocked by something you do not know.
Filehippo - Filehippo is your key to opening files that Windows claims are "in use by another user" or simply "can't be found." Avoid the hassle.
Wise Force Deleter - Delete Any File That Windows Can’t Delete.
Softonic - Softonic is a website that offers downloads for free software and games.
FileASSASSIN - FileASSASSIN is an application that can delete any type of locked files that are on your computer.
Softpedia - A library of over 1,000,000 free and free-to-try applications for Windows, Mac, Linux and Smartphones, Games and Drivers plus tech-focused news and reviews