Error deleting files and folders on my hard drive

Hi all,
Our company is implementing that every six month our hard drive must be sanitized from useless files to maintain a good hard drive space.
On my process of deleting some files, I encountered an error, that said cannot read the source file or disk.

Error Deleting File or Folder
Cannot delete File: Cannot read from the source file or disk.
What I did, I first checked if someone was using the files that maybe locked for deletion, none was using it.
So I also checked if the file is protected by our application, it is not. I also scanned my computer for some virus that might use that file, none was found.
So I restarted my computer in the hope it will just be some glitz, but same thing happened.
I can not delete the file, please share some thought on why I cant delete the file.
Thank you.
