OK, don't know if it was the factory or if I didn't tighten it enough, but when I took the cooler off there wasn't that much paste on it, and it was mostly on one side. Cleaned things up, used some of my old Arctic Silver Ceramic and it looks like I'm good to go. Ran the game for about 15 minutes, the temp stayed below 54c and game didn't black screen. If I do get this again though, I'll have to look somewhere else for the problem, I think.
The funny thing is nothing showed up at all in Event Viewer. I expected to see something under Application.
Looking at the CPU usage, this game doesn't seem to be nearly as CPU intensive as I have read. I run all game scenery settings at max which slows the load time a little, but I have the frame rate set at 30 and it's steady.
balane, your post inspired me to turn the screws a little tighter this time, lol. Not really sure it was necessary though. The heatsink contacts the cpu even without screws.