AIUI, Partition Find & Mount does not write to the drive, so it can't corrupt anything.
This stuff is all MOOT if he has the system image already. Anything that has been deleted runs the risk of being corrupted when restored. An image IS an EXACT copy of the data and not some program that scours the sectors for deleted data.
the software that you folks are mentioning is for a last resort if he never made a system image.