Windows XP includes support for Universal Plug and Play (UnPnP) which allows UnPnP devices to be connected over a network. There are currently limited UnPnP devices available and due to a recent security flaw it may be advisable to disable these services.
Open your registry and find the key below.
Create a new string value, or modify the existing value, called PowerdownAfterShutdown and set it to "1" to power off the computer at shutdown, or "0" to reboot.
Restart Windows for the change to take effect.
Note: This feature must be supported by the computer's BIOS.
|(Default)||REG_SZ||(value not set)|
Value Name: PowerdownAfterShutdown
Data Type: REG_SZ (String Value)
Value Data: (0 = default, 1 = power down)