If you have some data that you want to protect from others you can either encrypt it using freeware utilities like Axcrypt or you can disguise the folder.
By using Disguise Folders you can make your secret folder to look and act as a system file. You can convert your secret folder into Windows update.When somebody will click on that folder, he will be automatically redirected to windows update.
Disguise Folders is a freeware and portable utility.
 Here is the step By step Tutorial To Protect Secret Folders with Disguise Folders:

• Download Disguise Folders by clicking here.
• Run this Program and Click on Disguise Button to select the folder that you want to protect.

• Select any of the system icons that you want to give to your secret folder (Example: Windows Update)
• Now Click on Disguise Now button.
• Your Folder will get converted into System File (In this example it will be converted into Windows Update.)

How to Recover your Secret Folder?

• To recover your secret Folder Click on the Recover Button and select your Secret Folder.
• Now Enter a new Folder Name and Click on Recover Now Button

Disguise Folders is a great utility to protect your data and it doesn’t interfere with any system process.