KeyTweak – Remap system keys
Keytweak is a free keyboard remapper for Windows NT/2000/XP/Vista/Win 7. It makes use of Microsoft’s Scancode Map registry key to remap your keyboard.
KeyTweak cannot affect the Fn key on most laptops since that key doesn’t generate scancodes.
A reboot is required for changes to key mapping to take effect.
Reference:
http://webpages.charter.net/krumsick