Leo Folder Locker is a free/freeware folder locking software specially designed for those who want to secure there important data in just a simple folder.This folder locker software creates a secure folder user puts its important stuff in it and then that folder is locked down so that no one can access your data.It is a easy to use CLI based software.
Note :: Please make sure that you have unlocked all locked folders before reinstalling Windows or else you might face data loss.