StealthDisk

From Invisicom.com:

StealthDisk is a revolutionary patent pending security system enabling you to completely hide anything on your computer. Any type of files and folders, including complete applications may be hidden. Invoke StealthDisk with a secret user selectable Hot-Key combination and password and anything you have pre-defined as secret simply vanishes! ANY type of file search or software audit will not be able to reveal the existence of anything hidden with StealthDisk. Data is completely secure in all computer operational modes, including 'Safe Mode', MS-DOS� and boot from floppy drive. Accessing your hidden files requires a simple Hot-Key combination and your password. StealthDisk now includes Internet Stealth! Remove all traces of your online internet activities.
GENERAL FEATURES " Supports Windows 98, ME, NT, W2K and WinXP (FAT & NTFS). " Supports FAT and NTFS file-systems. " Easy to use. " Step-by-step Configuration Wizard.
SECURITY FEATURES " Defeat software audits w/patent pending technology. " Invisible installation (StealthDisk installation is undetectable). " Hide 'Control Panel/Add Remove Program' entries. " Delete 'Start/Recently Used Documents' lists. " Delete 'Recycle Bin'. " Runs 'Decoy' program if unauthorized access attempted.
INTERNET STEALTH FEATURES " Remove 'Cookies' " Clears Temporary Internet Files " Clears 'Internet History' page lists " Hide Favorites'
Advanced Features " Save password on floppy to be used as access key (in PRO version). " Optional encryption (in PRO version). " Emergency hide of all groups. " Option to close any back doors to StealthDisk's user interface (in PRO version).