I had the blue screen appear on my comp last week, it turned out it was an Nvidia driver what i had recently updated causing it. I just rolled back to the driver i used originally and it seems to have sorted the problem out.
I`ll be putting their number on the net very soon if they don`t hurry up I agree about Dennis Murphy, if it wasn`t for him i`d still be no further forward, they certainly listened once he had rang them.