Data Recovery Programs
The first few problems that I had were my own fault - a matter of not keeping accurate track of where my files were and of deleting them by mistake. Fortunately, Microsoft Windows itself has a data recovery program in the form of “undelete”.
Simply put, Windows never actually erases your files, but instead marks them as “deleted”, and moves them to a special folder called the recycling bin. There they will stay unless you go in and delete them manually a second time, or Windows runs out of space and needs to erase those deleted files.
Read more at Hard Drive Data Recovery