I have Windows 2000 and have encountered that error, and I have also seen that error when working on a help desk in an NT run network. I have come to this conclusion: I would only see that screen when doing something that is very memory demanding and the computer could not handle it. All that would have to be done to fix it would be to simply restart the computer, have the RAM dumped, and we would be back in buisness. You have something on there sucking up ALL of your memory and not allowing Windows to use any. This would most likely result in WIndows trying to kick up the processor, but the processor saying no and Windows thinking better of the situation, and decides to shut off everything so as not to burn it. Like said before, it's a memory thing. Uninstall software, and hardware. To the RAM thing previously mentioned by AMD643200+. Definetely a memory problem, and replacing the ram would most likely remedy the issue.