This has worked all the time for me and it's free. However, if you assign a new password with this program, sometimes it doesn't work. It is better if you leave the password blank, then log on to windows and change the password. Don't be intimidated by all the prompts. Usually the defaults will work for every case. I just checked, and it seems that the creator of this program has a brand new version. I haven't use it, but I supposed he might made improvements. Good Luck http://home.eunet.no/~pnordahl/ntpasswd/