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#21
There are easier ways if other tools dont help delete files
Open cmd and run chkdsk C: /f /x, then press Y to continue and reboot.
chkdsk will check the MFT (Master File Table) for the files existance on disk and correct any other index errors and the reboot will help clear the NT Handle Table from system memory.
Every application when its doing something with an object like a file/device will open a 'Handle' aka exclusive session, immediately when its finished using that object or file, it should release the Handle so other applications can do what they like with it. Sometimes these handles are not handled properly and never get released 'leaked', nothing minus a reboot can close that handle once its leaked because the application that locked the file has exited taking the Handle with it and afaik there's no application that can find a handle once its leaked.