Does the original error message contain the words 'IRQL_NOT_LESS_OR_EQUAL' ?
If it does their is a highly technical document here from Microsoft that gives detailed trouble shooting tips but it's not an easy read.
The only other thing I can find out on the net is the possibility that one of your RAM chips is breaking down.
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Do you know that we're all in line for succession to the throne? Really?
Well, if forty-eight million, two hundred thousand, seven hundred and one people died I'd be Queen.