Theres a program I used once called atapwd. I cant find what I remember to be the homepage but theres this page with steps and a link to the program. Just format a floppy and check the "create an msdos startup disk" (or something similar, its only on XP which I dont use so I might be wrong) then put atapwd.exe on it. Boot from the floppy and type atapwd. The program should start.