This problem has been noticed by many users of Windows 7 & 10. The usual method of being in Administrator mode, right clicking and entering into the file properties to change the ownership details and/or delete the files just doesn't seem to work.
What does sometimes work is to copy another file you don't need and that you do have permissions for, into the directory with the corrupted, unwanted files. Select the files you want to delete and the extra file, edit the permissions as a group and then delete all the files. Obviously you must be logged in as Administrator while doing this.
That seems to be the most successful method to date. All the files should be deleted and the disk space recovered.
As to why the files are not directly recognised, it may be that their content is corrupted in some way or that they are temporary copies made by the operating system as the files were being edited or some other operation which was corrupted or interrupted before completing. If Linux can't read a file, it probably is genuinely corrupted or damaged.