Help Needed,hurry Qucik

Sorry for not intriducing myself first,but i need help real bad.I don’t know how this all of a sudden happen but my windows NT 2000 is asking for the ADMINSTRATOR password and i don’t know it nor do i have the disk cause i got this computer from my uncle and he has everything and he is in CANADA.So any way can someone tell me how i can disable it from asking me to log-in sort of like on ME etc… where it just starts up normal.Can i fix this problem like on Start-up confic,cause i can’t get into the control panle without the ADMIN password,HELP please…i really neeed it.