I have a computer running Windows XP that is sometimes freezing during the shutdown process. The freeze occurs while the message "Windows is shutting down..." is displayed on screen, and happens approximately once a week (but not on a specific day/time). The freeze lasts at least over night (~8 hours) at which point I usually turn off the machine manually.
I've checked the event log after a freeze and found no errors or warnings. I also verified that the last message in the log stated that the EventLog service was shutting down.
I routinely clean up my startup services and programs, so there is very little unnecessary software running.
Because the problem is intermittent (and likely won't show up unless the computer has been in use for several hours), removing hardware or uninstalling applications isn't really a practical option in this case.
I realize that a complete list of applications and hardware in my machine could allow someone to recognize what's causing the problem, but I'm really more interested in learning how to track the issue down than simply learning which program is causing it in this instance. If there isn't anything useful posted within a day or two, I'll edit that information in.