Need some help. ;)

[Computernerd22]

Hello fellow members of AO. How can I block users without 'Administrative priviledges' on my Windows Vista system and XP with SP2 from changing users passwords or worse Administarors password from the command prompt? We all know opening command prompt and entering net user or net users will display all users on the windows operating system. A simple net user administrator * can easily change the Administrator password. How can I block/prevent this from happening to my system on both XP and Vista home basic version? Also, is their a way to catch someone in the eventlog or something similar to detect this?

All help is greatly appreciated.

examples:

Microsoft Windows (Version 6.0.6000)
Copyright (c) 2006 Microsoft Corporation.
C:\Windows\system32>net user /add pyr0 password
net user /add pyr0 mypassword
The command completed successfully.

C:\Windows\system32>net localgroup administrators pyr0 /add
net localgroup administrators pyr0 /add
The command completed successfully.

and this one:

Microsoft Windows [Version 6.0.6000]
Copyright (c) 2006 Microsoft Corporation. All rights reserved.User accounts for \\H4X0R
-------------------------------------------------------------------------------
C:\Users\mma>net users

Administrator spanky ASPNET
Guest mma
The command completed successfully.

C:\Users\mma>net users administrator *
Type a password for the user:
Retype the password to confirm:
The command completed successfully.