In less than 60 seconds you can do a registry change that decreases the waiting period that Windows XP takes when you initiate the shutdown command.
I put a quick video tutorial together which shows you the steps
Notes from Video:
Navigate to HKEY_LOCAL_MACHINE/SYSTEM/CurrentControl Set/Control.
Click on the "Control" Folder.
Select "WaitToKillServiceTimeout"
Double click on it and set a value lower than 1000.
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