How To Fix Windows XP Hangs On Shutdown

It was caused by the PCI modem. The modem was partially inserted into its PCI slot.
I’m not sure how it was happened as the screw holding the PCI modem is properly fixed.


Fixing Windows XP Hangs On Shutdown Problem

What I did to fix it that problem is simply, removed the PCI modem and re-inserted it properly. Once, done… it all back to normal and no more hangs during the shutdown process.

So, when you encounter something like that make sure you check the hardware specially the PCI card peripherals. They might not be properly inserted, although they are properly detected within the windows device manager,
that partially inserted PCI card could some potential problems as above.

If you are not familiar with opening the computer and checking it, I strongly suggest you get someone who is qualified to do it for you. Should you try opening your computer’s casing, make sure it is unplugged from the power outlet.
If it is attached to a UPS make sure you unplugged the power cord directly from your PC’s power supply.