I have been having this same issue. Bought a new PC a month ago, here are the specs:
Windows Vista-64
Intel Core i7 CPU
920 @ 2.67GHz
6.00 GB RAM
nVidia GeForce 9400 GT
I have run and played through Fallout 3, Bioshock, Call of Duty 2, Hearts of Iron 2, Sins of a Solar Empire without any problem. Then, three days ago, I began getting sudden and inexplicable BSODs when running Demigod. Same issue as Kovin, only, I will add that it never seems to happen when I'm in-game. It only happens when I am in the Demigod menu. I have received 15+ of these in the last three days on a computer that never BSODded before. Also, I have received varied and interesting BSODs, including, but not limited to:
IRQL_NOT_LESS_OR_EQUAL
PAGE_FAULT_IN_NONPAGED_AREA
Now, if either of these were true, you'd think I would have run into problems earlier, no?