X800 error

I've got some problems with my new SAPPHIRE X800 PRO
I tried to play the x800 demos (Ruby: The DoubleCross v 1.0 - v1.2,
Subsurface Scattering v1.0 - 1.2) but I get an error message:
Executing Ruby: The DoubleCross v1.0, v1.2 and Subsurface Scattering
v1.0 v1.2
I get the following error message:

//=====================================================
// ATI Sushi Error Log Created 6/20/2004 8:54 pm
//=====================================================
[AwFn.cpp] (line 2686): D3DAw Error: AwTexImage2D - Unable to create
texture object
[SuTexture.cpp] (line 2466): ERROR: Unable to load texture: color
'C:/3darg/Demos/R400/Rhino/Art/sourceimages/Agent/Leather_AO_COMP.bmp'
alpha ''
[SuTexture.cpp] (line 2468): width: 1024 height: 1024 bitdepth: 24
compressed: 6 mipmapped: 1
[SuTexture.cpp] (line 2472): bytesPerImage: 1398128 totalBytes:
1398128
[SOLInternals.cpp] (line 477): ERROR: Unable to load texture!
[SOLObjectManager.cpp] (line 562): ERROR: Unable to load dynamic
textures!
[Main.cpp] (line 881): Normal Application Exit


I've installed ATI Catalist 4.7 (tried with the 4.6 and 4.3: same
problem).

My system: P4 2,4 - 512 MB - Asus P4B533 - WinXP SP1 - DirectX 9.0b
I've tried e-v-e-r-y-t-h-i-n-g.
Any idea?