Ok now, to let ye all know how I got on. I did the scan, it took hours to complete. I could see where there were 'lost files' also a list of 'Raw' files. DSTM you were correct, Easeus would only give me 10gb for free so unfortunately I had no choice but to purchase the software as my son was getting desperate. I was just about able to store the files in a folder in my desktop.
What can be done with the harddrive now? Is it safe to use again? For the future what is the best means for holding files?