How to Restricting any desired application in Windows XP?
Go to:
HKEY_CURRENT_USER\Software\Microsoft\Windows\Current
Version\Policies\Explorer\DisallowRun
Create new String value with any name, like 1 and set its value to
the desired program's EXE file.
e.g., If you want to restrict msconfig, then create a String value 1
and set its value to msconfig.exe. If you want to restrict more
programs, simply create more String values with names 2, 3 and so on
and set their values to the program's exe file.