Secure Folder is a free software that can password protect, hide, lock, and encrypt folders with AES Encryption. This is a small application to secure your folders that is easy to use, and very secure. This application uses AES encryption to password protect folders, that is difficult to break.
Secure Folder has a simple to use interface where you can select the folders that you want to lock and/or hide. You can choose whether you want to just Lock a folder, or Hide as well. Good thing about Secure Folder is that it lets you lock and hide multiple folders together, instead of working on one folder at a time.