I had this problem for months and thought it was a general problem with my video card. This also happened with Heroes 5. Screen would go black and lock machine completely causing hard reset. I noticed on both games that anisotropic filtering was maxed out. I turned down only this one setting to 2x and it solved the problem. I haven't noticed this with any other graphic intensive games so it may be something in these engines causing a problem with my nvidia card or the latest drivers. I really can't see much graphical difference now and have no more crashes. Hope this helps someone.
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