True System Security Tweaker is a freeware security utility for tweaking and optimizing Windows operating system. It can simply be used as a portable application to customize and secure your PC to meet your safety requirements. You can define access level to lots of Control Panel applet functions including Desktop, Network, Passwords, Printers, System, Add/Remove Programs, etc.
Use it to disable system features for certain user profiles; hide Start menu items and Open-Save dialogs options. True System Security Tweaker has got a simple but nicely designed interface for selecting over 470 security options for your system. Also the Delphi source code is available too.