The Link goes to Microsoft which tells me there is no info available for this problem. It is very odd as I have actually been in the room when it happens and the machine just goes into a reboot. No power blips etc so at a lost to know what is happening.
Thanks for this although I see no logical thread in all the replies other than XP. No major changes have taken place on my machine and this problem only started a month or so ago. At first it was once a week then couple of times and now almost daily and always in the evening. Machine may have been on all day or only switched on at 1800. I think I will monitor the mains voltage and see how stable this is as I live out in the country. Any other suggestions would be much appreciated.
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