Deleting File(s) or Folder(s) Securely so that they are deleted for ever is a task done by specialized software applications. When you delete file on your Windows 8 or Windows 7 or any other Windows Operating System using FAT or NTFS File System, the files deleted either go to Recycle Bin or are deleted so that you cannot access them. Yes simple file delete actually does not deletes the bits and bytes stored on the hard disk. Windows Explorer simply makes the deleted file(s) un-accessible so that your hard disk space is available for other files, however the actual data is still lying on your physical hard disk.
There are lots of File Recovery Software Applications which recover already deleted files. When deleting files using Windows Explorer, the actual data of the file(s) deleted still remains on the hard disk and hence, these file recovery software applications are able to recover the deleted files. Depending on your method of search, you will find lots of freeware and shareware applications which together provide the functionality of recovering the deleted or lost files.
In case you deleted some file(s) long time back and now you wish to recover them, file recovery depends on your hard disk usage. When you deleted the file, Windows Explorer marked the hard disk space occupied by the file(s) as free for data storage and hence whether the actual data of the deleted file(s) is available or not, it can be found out by using some data recovery software application.
In case you want to delete file(s) and folder(s) really securely so that they are deleted permanently and are not recoverable using any File Recovery Software, you need to use a Secure File Deletion Software as displayed in the screenshot above. The Secure File Deletion software displayed in the screenshot above has been designed to delete data on Windows Computers so that it is not recoverable.
The Secure File Delete Software presented above writes random characters and even zeros to the file before deleting it. Effectively File(s) deleted with the above Secure File Delete Software would not be recoverable even with the best data recovery software. Before actually using this software to delete file(s) permanently, you can create some test files, delete them with above Secure File Delete Software and try to recover the deleted file(s) using the best available file recovery software.