PenyuLocker is another free software from Penyu Radius.
PenyuLocker is a small tool to secure your folder. With PenyuLocker, you can lock or unlock any folder with a given password. This will prevent unauthorised person from having access to any sensitive or confidential information in your computer.
Once locked, it will display the folder icon as a recycle-bin icon from your windows explorer. If you empty your recycle-bin, it wouldn't effect any files in your locked folder.
To unlock the folder, run PenyuLocker software. Browse to the previously locked folder and select "Unlock" function. It will again ask you for a password. Make sure you remember the password.