A Windows 7 account can be access outside it's normal running environment and tampered with. This video shows how Hiren's Boot CD 12 - Offline NT/2000/XP/VISTA/7 Password changer is used to access Windows 7 SAM System Security and we made changes to the existing accounts. This is useful when Admin/Support are call to a forgotten password scenario.
http://www.hirensbootcd.org/download/