Hi Neal
do you have any external hard drives hooked up when you get the messages?
Thing is, external hard drives that use caching will spit out those messages.
Delayed write failed messages are commonly associated with the following:
issues with a device driver (moreso on Win XP SP2), cabling problems(faulty or broken), media errors(drive failures), you might want to look into checking your hdd with this link:
http://www.grc.com/intro.htm, some bios settings, usb controller issues, memory issues(ram) and a few other things.
You can see how write-caching is handled for a particular volume by right-clicking on the icon for the drive in the "Disk drives" subtree of the Device Manager and selecting the Policies tabs. The options typically are "Optimize for quick removal" (everything is written to the drive immediately) and "Optimize for performance" (writes are cached).
The first option lets you quickly disconnect drives -- for instance, hot-pluggable USB "pen" drives -- without first disconnecting them via the Safely Remove Hardware icon in the system tray.
Trouble is, with that sort of error message, it could be a number of things, not just 1 or 2. Makes it hard and tedious to locate the trouble-maker.
Have a play-around with that Neal, let us know how you go.