Game restarts my pc

[G0ons]

Hi

When i load the demo i get to the point where just after the load screen and the game restarts my pc. I do not have this problem with any other game!

I have updated my graphics card & sound card to to the latest drivers. i have also updated the open Gl and directx software as per the troubleshooting guide..

Have managed to get through a couple of times and had no problem playing it. but it mainy wont work!

Dont wanna buy the game until i can get the demo working!

-------- THE HPL ENGINE LOG ------------
Engine build ID 20100818114615

Creating Engine Modules
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Creating graphics module
Creating system module
Creating resource module
Creating input module
Creating sound module
Creating physics module
Creating ai module
Creating gui module
Creating generate module
Creating haptic module
Creating scene module
--------------------------------------------------------

Initializing Resources Module
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Creating loader handlers
Creating resource managers
Adding loaders to handlers
--------------------------------------------------------

Initializing Graphics Module
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Setting video mode: 1024 x 768 - 32 bpp
Init Glew...OK
Setting up OpenGL
Vendor: ATI Technologies Inc.
Renderer: ATI Radeon HD 5800 Series
Version: 4.0.10151 Compatibility Profile Context
Max texture image units: 16
Max texture coord units: 16
Max user clip planes: 8
Two sided stencil: 1
Vertex Buffer Object: 1
Anisotropic filtering: 1
Max Anisotropic degree: 16
Multisampling: 1
Texture compression: 1
Texture compression S3TC: 1
Auto generate MipMaps: 1
Render to texture: 1
Max draw buffers: 8
Max color render targets: 8
Packed depth-stencil: 1
Texture float: 1
GLSL Version: 4.00
ShaderModel 2: 1
ShaderModel 3: 1
ShaderModel 4: 1
OGL ATIFragmentShader: 1
Adding engine materials
Initializing DevIL
Vendor String: Abysmal Software
Version String: Developer's Image Library (DevIL) 1.6.8pre Aug 12 2006
Version Number: 168
Adding engine post effects
--------------------------------------------------------

Initializing Sound Module
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Initializing OpenAL
Available OpenAL devices:
0. Generic Software on Speakers (SB X-Fi Xtreme Audio)(OpenAL default)
1. Generic Software on Realtek Digital Output (Realtek High Definition Audio)
2. Generic Software on Digital Audio Interface (SB X-Fi Xtreme Audio)
3. Generic Software on Realtek Digital Output(Optical) (Realtek High Definition Audio)
4. Speakers (SB X-Fi Xtreme Audio)
5. Digital Audio Interface (SB X-Fi Xtreme Audio)
Trying to open device 'Generic Software on Speakers (SB X-Fi Xtreme Audio)'... Success!
Number of mono sources: 32
Streaming setup: 4 Buffers x 262144 bytes each
--------------------------------------------------------

Initializing Game Module
--------------------------------------------------------
Adding engine updates
Initializing script functions
--------------------------------------------------------

User Initialization
--------------------------------------------------------
- DEMO VERSION -
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Game Running
--------------------------------------------------------
-------- Loading map 'menu_bg.map' ---------
Cache out of date! Reloading collada file 'c:/program files (x86)/steam/steamapps/common/amnesia the dark descent demo/static_objects/castlebase/menu_door.dae'
Cache out of date! Reloading collada file 'c:/program files (x86)/steam/steamapps/common/amnesia the dark descent demo/static_objects/castlebase/wall/default_extension.dae'
Cache out of date! Reloading collada file 'c:/program files (x86)/steam/steamapps/common/amnesia the dark descent demo/static_objects/decals/rose_petals02.dae'
Cache out of date! Reloading collada file 'c:/program files (x86)/steam/steamapps/common/amnesia the dark descent demo/static_objects/decals/rose_petals03.dae'
Cache out of date! Reloading collada file 'c:/program files (x86)/steam/steamapps/common/amnesia the dark descent demo/static_objects/cellarbase/stairs/welder_wood.dae'
MeshEntity Loading: 1944 ms
Primitive Loading: 431 ms
Decal Loading: 100 ms
Object Combining: 0 ms
Compilation: 2 ms
Combining: 1322 ms
Sorting: 1310 ms
Meshes: 5 ms
Bodies: 7 ms
Static Objects: 3800 ms
Cache out of date! Reloading collada file 'c:/program files (x86)/steam/steamapps/common/amnesia the dark descent demo/entities/bottle/amnesia/amnesia_bottle_menu.dae'
Entities: 1147 ms
Compilation: 1 ms
Saving cache file for 'c:/program files (x86)/steam/steamapps/common/amnesia the dark descent demo/main_menu/main/menu_bg.map'
Total: 4973 ms
Meshes created: 28
Bodies created: 5
-------- Loading complete ---------