To lock folders and files in Windows XP, 7 or other systems, there are built-in features. You can lock your folders and files with your Windows login password by this method. Since it is locked with your system password, it is not portable and is not as secure as you might expect. I think that's why you ask for some software here. A third-party folder lock software will be very helpful. I usually use Advanced Folder Encryption since it can lock folders in both my hard drive and USB drives.
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