bad luck!i do not know that what' the format of you C(if you windows2000 install c,if you disk c is fat32 format.then you can do than del c:\winnt\system32\config\sam ,yes, del the sam file.then you login with administrator without password. if you disk c is ntfs format.you can unconnect you disk and connet another pc,then del the SAM file.you can recovery you password.Do not forget you password next time!good luck for you!