Короче, это из-за 32 разрядной Висты
» Нажмите, для отображения текста «Some users running Dawn of War II – Beta on Windows Vista 32-bit edition may run into problems when running certain graphics settings. If you are encountering crashes to desktop during gameplay please try the following graphics settings, found in the options tab off the main menu.
Set the Predefined Settings to “Medium” or “Low.”
Disable Antialiasing
Set the Texture Detail to “Medium” or “Low”
Set Shadows to “Low” or “Off”
Set Reflections to “Low”
Set Terrain Detail to “Medium” or “Low”
Reduce both Effects Fidelity and Density to “Medium” or “Low”
Set Rain Detail to “Low”
Disable Soft Particles
The exact settings required to stabilize the game will vary depending on the graphics card make and available video memory.
We apologize for any inconvenience this causes our Beta participants. We are working on a fix that will resolve this issue for the retail product, and allow Vista 32-bit users the full range of their graphics card’s abilities.
Windows XP, Window XP 64, and Windows Vista 64-bit edition users should not encounter the same problems.
http://community.dawnofwar2.com/viewtopic.php?f=44&t=3651
Кстати в логах игры Виста 32 бит значится как Windows XP??? с вопросиками,так что бетка не без косяков)