Had the same problem on my NT 4 machine. Cake, (The Bios Fryer), over at K6Plus sorted it out by posting as follows :
cake
Post subject: Posted: Mar 30, 2006 - 03:03 PM
Bios Fryer
Joined: Jul 01, 2001
Posts: 215
Location: Stockholm, Sweden
http://home.eunet.no/pnordahl/ntpasswd/ Works like a charm when it comes to resetting passwords, been using it
on NT/2k and XP without a hitch.
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XP-M 2400+ @ 10x220, Epox 8RDA3+
512 MB PC3200 KingMax
15 GB Quantum Fireball LCT + 60 GB Seagate Barracuda IV
Radeon 8500LE