Use NTPasswd.
*home.eunet.no/pnordahl/ntpasswd/
It's an open source password recovery utility for Windows NT. Just download the iso from the site (link mentioned above) and burn it to a CD (you could use a friend's computer for that), boot using the CD, and then you can reset your password from there. Before doing anything, read the instructions on the site.
Warning: This utility is for personal use. Do not try to use this for anything that it was not intended for. If you get caught using this thing for illegal purposes, I take no responsibility

.