SysGuard is one of the most powerful system lockers available. It securely locks down your computer, preventing access to anything on it, like the Desktop, Taskbar and programs. It disables system keys such as CTRL+ALT+DEL and ALT+TAB. The only way to regain access to the system is to enter the correct passphrase, which can be up to 64 characters long and is case-sensitive and encrypted. It has many features, such as the ability to lock the system on startup, an option to disable the Windows Boot Keys and Safe Mode, a very configurable interface, HotKey support, system idle locking and much more all in an extremely small package. It is a great tool to prevent unauthorized access to your system.