Free Recover is an open source Data Recovery Software found in windows operating system. As seen if files are deleted from the Windows Operating System, they are not permanently deleted but moved to the recycle bin. Even so, if deleted from the recycle bin, they can still be recovered as they are on the hard drive.
Its success is based on the difference in time from deletion and recovery. If a file is deleted, and not recovered soon thereafter, the space it had occupied on the hard drive could be used to store new files. This may result to overwrite of the former file hence may only be partially recovered.