That’s normal when running anti-virus software and WinXP (you do have AV soft, right?).
Also, if you updated XP with all the latest patches, they cause XP to take a while to shut down (around one minute).
Win2000 takes even longer.
My suggestion is to turn the power off on the monitor, walk away, and let the system shut down on its own.
That’s what I do for my two XP systems and a Win2000 system.
Good luck!

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