AdwCleaner - AdwCleaner is a free removal tool for : Adware (ads softwares)
LockHunter - It is a free tool to delete files blocked by something you do not know.
HijackThis - HijackThis is a malware detection and removal tool that's ideal for users who demand more granular control over every aspect of their computer's performance.
IObit Unlocker - Never Worry about “Cannot Delete Files” on Your PC
AdwareMedic - AdwareMedic is a specially designed tool to remove all kind of adware and potentially unwanted threats and program from the PC.
EMCO UnLock IT - Unlock file or folder, locked by the system or by an application