I’ve put together a CD or USB Drive image which contains things needed to reset the passwords on most systems.
The bootdisk should support most of the more usual disk controllers, and it should auto-load most of them. Both PS/2 and USB keyboard supported.
More or less tested from NT3.5 up to Windows 8.1, including the server versions like 2003, 2008 and 2012. Also 64 bit windows supported.