I have an older Windows 2000 PC (Pentium 1 MMX era) and whenever it goes to shutdown it won't power off automatically. Instead it displays a "It is now safe to turn off your computer." screen.

I configured a laptop for some employees who rotate on-call responsibilities. The laptop is a member of our active directory domain, but since the primary use of the laptop is at employee's homes ...

Provide physical security for servers. Doing so for every machine may not be practical, but your servers need to be in a locked room with monitored access. Disable the guest account. Windows 2000 ...