Since SP5 and beyond my game was intermittent crashing also. I turned the shaders down to basic and it stopped the crashing. It seems to be a problem with HDT in some way. And I have all the updates for my card and it was flawlessly running with details and shadows high before SP5. Hope the next patch cures the problem!
After all the SP5 and HF updates, I had to let the system idle with the starting window opened. I was seeing it 'processing' something, because the items in the lower window were not populating right away. I think it was a good five to ten minutes, I didn't time it.
