Generally when we wish to lock a folder , we use softwares such as Folder Lock . However you can achieve almost the same thing without the use of any software . The trick which i am going to tell you will make your folder change into control panel , so if anyone tries to open it , the control panel will open and your data will remain hidden . Here’s what you need to do .
1.    You have a directory  F:games which you want to lock
2.    Open the notepad and type the following ren games games.{21EC2020-3AEA-1069-A2DD-08002B30309D}
3.    Save the following with the “.bat” extension , this file should be kept in the same drive in which the folder exists and will be used for locking the folder so give a suitable name such as lock.bat
4.    Now open a new file in notepad and type the following ren games.{21EC2020-3AEA-1069-A2DD-08002B30309D} games
5.    This file will be used to unlock the folder , name it as “unlock.bat” . You can use any other name but use the .bat extension.
6.    Both the files should be in the directory in which the folder exists . Double click the “lock.bat” to lock the folder . the folder will change its icon to that of control panel and anyone who opens the folder will see the control panel contents.
7.    Double Click ”unlock.bat” and you will get your original folder .
8.    For further security you can save both the files anywhere else and copy them only when you need to lock or unlock.