Amnesia won't start

[diih]

I reinstalled the gpu drivers just before I wrote this post, didn't help. :/
And as for Windows 8.1, I installed it yesterday as an update over my existing Windows 8 installation, and both Amnesia: TDD and AMFP ran smoothly on it, but not on W8.1..

This is what the hpl.log says:

Spoiler below!

Version 1.20

-------- THE HPL ENGINE LOG ------------
Creating Engine Modules
--------------------------------------------------------
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
--------------------------------------------------------
Creating loader handlers
Creating resource managers
Adding loaders to handlers
--------------------------------------------------------

Initializing Graphics Module
--------------------------------------------------------
Init lowlevel graphics: 1920x1080 disp:0 bpp:32 fs:1 ms:0 gpufmt:2 cap:'Amnesia - A Machine For Pigs Loading...' pos-1x-1)
Setting video mode: 1920 x 1080 - 32 bpp
Init Glew...OK
Setting up OpenGL
Vendor: Microsoft Corporation
Renderer: GDI Generic
Version: 1.1.0
Max texture image units: 3
Max texture coord units: 4
Max user clip planes: 6
Two sided stencil: 0
Vertex Buffer Object: 0
Anisotropic filtering: 0
Multisampling: 0
Texture compression: 0
Texture compression S3TC: 0
Auto generate MipMaps: 0
Render to texture: 0
Max draw buffers: 13
Max color render targets: 21
Packed depth-stencil: 0
Texture float: 0
GLSL Version: (null)
ShaderModel 2: 0
ShaderModel 3: 1
ShaderModel 4: 0
OGL ATIFragmentShader: 0