This is an error I've never seen. Google showed that I'm not the only one in need of this driver...But there seems to be a billion versions and types.
I ran a driver update and it showed nothing. What does this driver do? I saw something about firewire -- which I don't have or use (I don't THINK I have it), so why this error now "out of the blue" after a few years on this machine? D I need to worry about it? If not, can I "turn it off"?
I found it: In device manger, you can see the 1394 controller. I picked Update, but used "Let me pick from..." and in the list, picked the legacy driver. All is OK again.