Blue Screen of Terror
For your information:
At least six times over a period of two days (or a little more), my Windows XP Home presented me with the Blue Screen of Terror "Windows Has Detected a Serious Error and Must Close".
The leads identified Hewlett-Packard printer drivers. I hadn't updated them in recent memory and was not attempting to print.
Further investigation identified the problem as being with the driver for my HP Photosmart 7850 ink-jet printer, which I seldom use. Microsoft says that the driver [HPZid412/HPius12] "has stopped working and HP is working on fixing it". I was told to download the latest driver - which was dated 2005. Obviously no fix has yet appeared. This driver seems to have been used for the whole 7800 series and probably others.
I suspect an update to XP has made the HP driver incompatible. Of course the problem is HP's in Microsoft's view.
My solution has been to go to Control Panel and delete everything from HP. My system is again stable (knock on wood) and my Brother laser printer works fine.