I M giving a major solution today.after this tutorial no one will be able to change the screen resolution or the background of your PC Even with the administrator privileges.
U have to change the registry key a little with the xp registry editor.
Open up the registry editor with run.First Start run by pressing the windows_logo key+R on the keyboard. after that type in "regedit" without the quotes.Navigate to the following one by one:-
HKEY_LOCAL_MACHINE>
SOFTWARE>
Microsoft>
Windows>
CurrentVersion>
Policies>system.
Now create a new Dword valuer by going to "Edit>New>DWORD value"Rename it with the following without the Quotes "NoDispcPL" & double clickon it a editing window will appear set the value data to 1 That's all Now the display properties is disabled.anybody will not be able to enter there to enable display properties just delete the Dword value.
This Tutorial is also available in "BANGLA"