This tutorial will guide you through the steps to create a simple password protected folder in your PC. This requires NO additional 3rd party software.
While the steps below will guide you to successfully make a password protected folder in Windows, this method is not fully secure. It is good enough to deter the average computer user but an advanced user will be successfully able to access all your secrets 
Step 1: Create a new folder and name it whatever you like.
Step 2: Open the new folder and right click in the white space in the folder. Go to: New->Text Document.
Step 3: Open the new text document you just created and copy and paste the following code.
cls
@ECHO OFF
title Folder Private
if EXIST "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}" goto UNLOCK
if NOT EXIST Private goto MDLOCKER
:CONFIRM
echo Are you sure you want to lock the folder(Y/N)
set/p "cho=>"
if %cho%==Y goto LOCK
if %cho%==y goto LOCK
if %cho%==n goto END
if %cho%==N goto END
echo Invalid choice.
goto CONFIRM
:LOCK
ren Private "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}"
attrib +h +s "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}"
echo Folder locked
goto End
:UNLOCK
echo Enter password to unlock folder
set/p "pass=>"
if NOT %pass%== PASSWORD_GOES_HERE goto FAIL
attrib -h -s "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}"
ren "Control Panel.{21EC2020-3AEA-1069-A2DD-08002B30309D}" Private
echo Folder Unlocked successfully
goto End
:FAIL
echo Invalid password
goto end
:MDLOCKER
md Private
echo Private created successfully
goto End
:End
Step 4: In the above code, replace the key PASSWORD_GOES_HERE with the password you want to use to unlock the folder. For example if you want the password to be 123456, the line should look like:
if NOT %pass%== 123456 goto FAIL
Step 5: Save your new file in the .bat format with the complete file name being locker.bat. To do this, make sure to change the Save as type: to All Files (*.*).
Step 6: In the folder you created back in Step #1, double click the locker.bat file and there will now be a new folder named Private where you can put anything you want.
Step 7: Upon exiting, double click the locker.bat file again. It will prompt you to answer whether you want to lock your folder or not. Press Y and the private folder will disappear.
Step 8: In order to retrieve the Private folder, all you have to do is double click the locker.bat file and enter the password which you set in Step #4 and the folder will appear again for you to access.
Step 9: You’re Done!! 
Source Code: social.microsoft.com
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