Macedon campaign (VH), during a campaign turn (can't remember the faction) but the game CTD and then caused a BSOD. The first I have ever had in more than 12months of running Windows 8.

The BSOD:

The bugcheck was: 0x0000003b (0x00000000c0000005, 0xfffff8800415d859, 0xfffff880077369d0, 0x0000000000000000

According to MS :

http://wer.microsoft.com/responses/R...loseAllocation

The only thing thats changed on the system is "Steam"/R2