MCE won't shut down post updates installed.

[etcarroll]

MCE won't shut down post updates.
Wonder if anyone has experienced this - after install of MCE my HTPC shut
down fine for a few months. Then I downloaded all the available updates a few
months back.

Now, get to the window "Windows is shutting down" next thing should be a
black screen and a powered-off HTPC, but system hangs right here.

Went to MS web page for troubleshooting XP not shutting down, based on that
found a driver conflict that, once corrected, left me in a state of the HTPC
fully shuts down 1 out of 3 times. This is a problem as I record HD OTA via
Fusion card, and set it to turn off HTPC after last recording, it's a drag
getting up for coffee and find the HTPC still 'humming'.

Before I go in and uninstall all the updates, does anyone have a thought as
to what I'm looking at here? How best to troubleshoot?

MCE 2005
P4 3.0 cpu
Intel D865Perl mobo
2 SATA drives
1 gig Corsair ram
Fusion 3
ATI 9600 XT