I ran the free space cleaner option in CCleaner's Drive Wiper tool on the external hard drive ( I can assure everyone I was 100% careful to select the free space option and not the entire drive contents) and the next time I opened up the folder lock software, the contents of the secure 'locker' folder were 'missing' (ie as in, not visible in windows explorer type window). (No folder nor files views are set to 'hidden', it's not that)
So next, I ran piriform Recuva and it finds the files and tells me they have a status of 'not deleted'.
Anyone able to tell me how I make the locker folder and all its files visible again?