i assume you are using Windows XP.
try log off and login as "Administrator", if you remember the password. Try blank password first. if it doesn't show in the list, press Ctrl-Alt-Del twice and type it in.
if no joy, you can download this
iso, burn it onto CDR as disk image, not data.
restart and boot from this CD, then you have the chance to change/reset/blank any user's password. but take care not to do other thing. follow the author's instructions.
good luck!
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