for solving thisproblem, there is another simple way. there are SAM flies in the hard disk. you boot on your computer upto the MSDOS prompt using any of the boot disk of eithr win98,2000. then find the SAM file under C\Windows\repair and copy and paste it in the c:\windows\system32\config folder. there alredy exists a file and replace that file. then restart your pc and it would not ask for password. then go to control panel and then reactivate the user accounts.
or try this
There is a LINUX program at
http://home.eunet.no/~pnordahl/ntpasswd/ which allows you to set the Windows 2000 (or NT) password to whatever you choose. This procedure creates a bootable LINUX diskette from which you do your magic to the Windows 2000 system. Just follow the detailed instructions. I have used this several times and have always had success. Hope this helps.