Hide Master 

Hide Master is powerful but easy to use tool for hiding windows and programs. Hide Master allows you to hide (and unhide) specified windows and groups of windows by pressing a combination of Hotkeys.
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ATS Warning! The Boss! 

Avoid others seeing data in your PC (message programs, bank account numbers, photographs unsuitable for children) hiding windows, applications, the icons in the systray, and mute your sound card. Try the fully version of Warning! The Boss! FOR FREE
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Folder Security Personal 

This tool keeps files and folders secret and safe by hiding and locking them, or by making them read-only with a password. It can lock cdrom, removable drives, and hard disks. It can also repair and prevent malicious changes on Internet Explorer.
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Hide My Folders 

Hide My Folders by Eltima Software allows hiding files and folders from viewing, accessing and searching completely, so that only you know that those files or folders exist. Hidden folders stay invisible and safe until you unhide them.
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Folder Security Professional 

This tool keeps files and folders secret and safe by hiding and locking them. It can lock cdrom and removable drives. It can also repair and prevent malicious changes on the settings of Windows and IE. It supports any number of accounts.
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Hide Folder Flex 

Hide Folder Flex is an access control utility for Windows. It keeps files and folders secret and safe by hiding and locking them, or by encrypting them with a password. It's also able to restrict accesses to local hard disks, CD-Roms, floppy.
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