File & Folder Locker (USB Edition) :-Not able to unlock Folder (Locked)

Sub:- Tareq's File & Folder Locker (USB Edition) :-Not able to unlock Folder (Locked)
Sir,
Last three years I am using the said software.It worked fine. Few days back,I locked one important folder containing softwares. From yesterday I tried to unlock the same, but every time I am getting message "File & Folder Locker - An error occurred. File & Folder Locker cannot process the folder." and not able to unlock. Kindly help me to give solutions to unlock the same & restore my important data.(OS - Windows XP)
Thanking you sir.