There is another thread on these boards that discuss a Linux boot disk that allow you to change the Administrator password on NT and Win2K that is definately easier. If you do have your machine set up securely (in that normal users can't copy over LOGON.SCR) then you will have to go through another step which makes the process more time consuming.
If you have forgotten your Administrator password and want to use the LOGON.SCR/CMD.EXE trick and do not have permissions to copy over the LOGON.SCR as a normal user you will have to get your Windows NT or 2K CD and do a minimal OS install to a directory other than where the original copy of Windows was installed (without formatting the drive). For instance, NT and 2K normally installs to C:\WINNT. Install a new copy into C:\WINNT2. log in to the new copy of Windows as Administrator, "copy C:\WINNT\SYSTEM32\CMD.EXE C:\WINNT\SYSTEM32\LOGON.SCR".
Reboot into the original install of the OS, wait 15 minutes, get the CMD prompt and run User Manager to reset the original Administrator's password, delete the second copy of NT/2K.
[ May 04, 2002: Message edited by: VoidMain ]