MB is on the track!
The service pack information is correct,, one thing that I might add is that the Hardware drivers have become corrupt.
Have you added any new hardware as of late? On the MUP i would say either the USB 2.0 or the Network card, On the NDIS I would say NIC,, on the AGPxxx,, I would say video,,
Overall,, I would do a couple of things,,
You could try SYSTEM RESTORE to a date prior to the install of the update, (as repair failed)
First reinstall video drivers to the Card, if no go, then remove PCI cards from device manager,, do one at a time and reboot until the machine reboots normally or you run outta cards,,,
If this fails, check for BIOS updates, or reset to default your present BIOS,,
this is definitely a Hardware based issue...
If all fails,,, *sniff sniff* a clean install (after backup) , and not recreating the issue would probably be your best bet..
good luck ,,
MCSE, MCP+I, A+
\"You\'re the Disease, and I\'m the Cure!\"