windows 2000 advanced server password reset

i have a server that operate with windows 2000 advanced server
we forgot the admin password
and this server is also standalone server
and have a critical data
we cant login
we tried to crack the admin password by
erd commander but it didnt work correctly
(we tried erd on other system like winxp and it works)
we tried other CLI utility like a offline nt registry editor
but all didnt work ??????????!!!!!!!!!
wat we gonna do ?
please help me ?