Thanks for your concern. I have 2 Hard drives a Western Digital and a Maxtor. I have installed XP on both and disconnected them one at a time to test whether the problem persists. No matter which HDD is connected I still get the problem, It occurs more of less randomly and each time the code is different. I have even sent an error report to Microsoft, they merely tell me that it is a driver error.
I have spent the morning exchanging graphics cards, cables and reloading XP, nothing helps so I guess I shall be ordering a new mobo on Wednesday (Tomorrow is a vacation in hard working Europe :
)
Any more suggestions gratefully received.
Chris