If you are looking for one good completely free software to lock and unlock your files/folders then download Folder Lockbox freeware which password protects your files in folders or the whole folder.
Folder lockbox password protecting freeware locks files, folders, drives, USB drives and CD/DVD-RW,apart from that the software has cool 5 different skins too and is really simple to use.The software comes with a password protection so that no one can access the software unless the right password is entered.
A look on some of the features,benefits of Folder lockbox :
To use Folder lockbox,enter your password and browse for the files or folder you want to lock or unlock! Compared to other trial version folder locking software,I feel Folder lockbox is the best as it is free full version and completes the task as promised!