First off, are you running Backup Exec or any anti-virus applications? If so, disable them and see if that solves...
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If the problem still exists, start looking for any other third-party drivers that might be running that could interfere with shutdown. Look down the process list in Task Manager and kill anything that does not match a pristine system.
If that does not solve the problem, start looking at firmware. Flash the BIOS on your motherboard and any peripherals. Remove all unnecessary hardware.
Try a parallel installation of Windows 2000 in a separate partition and see if you get the same behavior. If so, you know you have a hardware issue. Check to see if there are KnowledgeBase articles on your motherboard and chipset. It might not be fully ACPI compliant.
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