Changing the Administrator password if you have forgotten it.

Install a second copy of NT onto the machine into a difference dir/drive (it only has to be a minimal installation) and boot into this installation

Copy the srvany.exe from the resource kit into a dir, e.g. c:temp

Start regedt32

Move to HKEY_LOCAL_MACHINE and select the root

From the Open menu select "Load Hive"

Move to %systemroot%system32config of the main NT installation, i.e. if your main installation (the one whose password you are trying to change) is installed at d:winnt you would move to d:winntsystem32config

Select System and click Open

You will be asked for a key name, enter Mainreg and click OK

Select the "Select" branch and write down the Default value, e.g. 0xn, e.g. 0x1. This will be used to load the ControlSet00n

Move to HKEY_LOCAL_MACHINEMainregControlSet00nServicesSpooler and take a note of the ImagePath value (it will usually be %SystemRoot%system32spoolss.exe).

Change ImagePath to c:tempsrvany.exe (or where ever you copied the file to), click OK

Move to Parameters and add a Value of type REG_SZ called Application. Once added double click the new value and set to %systemroot%system32et.exe

Add another Value of type REG_SZ called AppParameters. Once added double click the new value and set to "user Administrator password".

Move back to HKEY_LOCAL_MACHINEMainreg and select "Unload Hive" from the open menu. Click Yes to the confirmation

You should now reboot and boot off of your original NT installation. Wait a few minutes and then logon as the administrator with password password.