LockHunter - It is a free tool to delete files blocked by something you do not know.
Malwarebytes - Malwarebytes protects you against malware, ransomware, and other advanced online threats that have made antivirus obsolete and ineffective. Free Anti-Malware & Malware .
IObit Unlocker - Never Worry about “Cannot Delete Files” on Your PC
Kaspersky AntiVirus - Download the best FREE antivirus for Windows-based desktops, laptops, & tablets and get the core protection against viruses, spyware, phishing & dangerous websites.
EMCO UnLock IT - Unlock file or folder, locked by the system or by an application
AdwCleaner - AdwCleaner is a free removal tool for : Adware (ads softwares)