Leaving your PC un-attended for hours together without the fear of unauthorized access is possible if you have, Lock My PC.
    As the name suggests with this tool you can lock your PC and leave it idle for hours together without the fear of any snooper or miscreant mishandling. This unique one-click system locking software instantly locks your system with a hot key or from the system tray, thereby disabling hot keys, mouse, locks CD/DVD ROM doors and displays a lock screen. The features included in the tool are; it supports system locking manually or with a menu or hotkey or set up auto lock whenever the computer is idle, secured startup lock, multi-user support, multi-monitor support, auto turn-off when the PC has been idle for a long time, custom lock screens, screen saving effects, screen transparency, password protect program settings, and much more.
    Attain utmost privacy and security with this tool that also supports a keyboard driver that can block key combinations like Ctrl+Alt+Del.