1. Open the location(folder) where the files are present.
2. Select the file/files that you want to delete.
3. Now, instead of pressing the delete button, press the shift+delete buttons.
4. A warning msg will be displayed that warns about the deletion of files permanently. Press Yes.
5. Your files have been deleted permanently. They no more appears in the folder.
Note: Now, you can't recover these files from the recycle bin. They are deleted permanently.