Demo Crash
 

Initially, the demo would flicker the screen and then do nothing.

Fix:
x:\Program Files (x86)\1C Company\King's Bounty. Armored Princess Demo\data\game.ini

changed from 0 to the following values (my resolution) -
setf ~screenresoultionx 1920
setf ~screenresoultiony 1200

Demo now starts. After all advertising completes, the game crashes to this dialog:

---------------------------
Application aborted!
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C:\work\skyfallen\tbm\BMRender\rmode.cpp(5509): DirectX call failed: -1, -1, E_FAIL (An undetermined error occurred inside the Direct3D subsystem)
---------------------------
OK
---------------------------

Update:
Executed - DirectX End-User Runtime Web Installer, no update necessary, dialog exited.

Video drivers: NVIDIA GeForce GTX 275 195.62 Your PC currently has the latest driver installed for your GPU. No driver update is necessary at this time.

Added settings to game.ini file -

setf ~r_fsaa_h_sample 0
setf ~r_fsaa_v_sample 0

Allowed me to start a new game but once the game reached 100%, the same crash dialog occured.

Note: C:\Users\<YourName>\Documents\My Games\Kings Bounty Princess Demo - directory is empty

DxDiag Info:
Operating System: Windows 7 Ultimate 64-bit (6.1, Build 7600) (7600.win7_rtm.090713-1255)
Language: English (Regional Setting: English)
System Manufacturer: INTEL_
System Model: D975XBX2
BIOS: Default System BIOS
Processor: Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz (4 CPUs), ~2.4GHz
Memory: 4096MB RAM
Available OS Memory: 4094MB RAM
Page File: 2574MB used, 5611MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7600.16385 64bit Unicode

Latest nvidia drivers which you have cause this error

The demo is dated 4/7/2009, video drivers are a moving target, why hasn't the demo been updated?

No, demo was released 12th november. Why i do not know :p