Folder Vaccine PC - Version 3.2 Folder Vaccine PC is a powerful desktop utility that keeps files and folders secure and safe by hiding and locking them, or by making them read-only with a password. With Its' simple to use drag-and-drop interface; Folder Vaccine PC is the easiest way to protect your important files and folders. Its robust locking capabilities can also lock floppies, CD-ROMs, removable disks, and local hard drives.