1)   RebootEx 2.13
Advanced system utility for Windows NT/2000/XP operating systems that allows you to automatically shutdown, power off, remotely shut down, shutdown at a specific time, reboot and/or relogon to your computer.

 2)   Shutdown Lock 1.5
Get Shutdown Lock and enable hibernate and stand by feature in application, like FlashGet, Use Windows XP fast user switching feature more safety, prevent unexpected system shutdowns or restarts that could immense and sensitive data loss.