Hidden folders on ext hard drive

Hello,
dears sirs and lasses,
was wondering if anyone can help me please ?
i have a prog called ffhide, which hides folders and files rather than using the tradditional folder options route, however, coming home from the gulf after serving 4 months out there, i used it hide folders etc before flying home, having got home, and wanting to unhide them, the ffhide prog says, the file has been deleted or re-named, which i have done neither, i have 400 odd gigs worth of stuff hidden but now cannot access, including pics and video of my father who died recently, so you cansee why i'm a bit frantic !! any help would be very much appreciated thank you .