I had the same problem,the cause of the lock ups, black screens and blue screens in my case was the GPU i have a GTX285 which was factory overclocked.I found out the stock clocks and used them ,no more problems
it hasn't happen since i changed the back to stock clocks.So if i was ye look
into your GPU's and lower your clocks see those it help.But what i have read
about display driver crashs it could be hundreds reasons why it happens.
Good luck cause this prob is a right PITA
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